
Engineering is the practice of using
natural science
Natural science or empirical science is one of the branches of science concerned with the description, understanding and prediction of natural phenomena, based on empirical evidence from observation and experimentation. Mechanisms such as peer ...
,
mathematics
Mathematics is a field of study that discovers and organizes methods, Mathematical theory, theories and theorems that are developed and Mathematical proof, proved for the needs of empirical sciences and mathematics itself. There are many ar ...
, and the
engineering design process to
solve problems within
technology
Technology is the application of Conceptual model, conceptual knowledge to achieve practical goals, especially in a reproducible way. The word ''technology'' can also mean the products resulting from such efforts, including both tangible too ...
, increase
efficiency
Efficiency is the often measurable ability to avoid making mistakes or wasting materials, energy, efforts, money, and time while performing a task. In a more general sense, it is the ability to do things well, successfully, and without waste.
...
and
productivity
Productivity is the efficiency of production of goods or services expressed by some measure. Measurements of productivity are often expressed as a ratio of an aggregate output to a single input or an aggregate input used in a production proce ...
, and improve
systems. Modern engineering comprises many subfields which include
design
A design is the concept or proposal for an object, process, or system. The word ''design'' refers to something that is or has been intentionally created by a thinking agent, and is sometimes used to refer to the inherent nature of something ...
ing and improving
infrastructure
Infrastructure is the set of facilities and systems that serve a country, city, or other area, and encompasses the services and facilities necessary for its economy, households and firms to function. Infrastructure is composed of public and pri ...
,
machinery,
vehicles,
electronics
Electronics is a scientific and engineering discipline that studies and applies the principles of physics to design, create, and operate devices that manipulate electrons and other Electric charge, electrically charged particles. It is a subfield ...
,
materials, and
energy systems.
The
discipline
Discipline is the self-control that is gained by requiring that rules or orders be obeyed, and the ability to keep working at something that is difficult. Disciplinarians believe that such self-control is of the utmost importance and enforce a ...
of engineering encompasses a broad range of more
specialized fields of engineering
Engineering is the discipline and profession that applies scientific theories, mathematical methods, and empirical evidence to design, create, and analyze technological solutions, balancing technical requirements with concerns or constraints on s ...
, each with a more specific emphasis for applications of
mathematics
Mathematics is a field of study that discovers and organizes methods, Mathematical theory, theories and theorems that are developed and Mathematical proof, proved for the needs of empirical sciences and mathematics itself. There are many ar ...
and
science
Science is a systematic discipline that builds and organises knowledge in the form of testable hypotheses and predictions about the universe. Modern science is typically divided into twoor threemajor branches: the natural sciences, which stu ...
. See
glossary of engineering
This glossary is split across multiple pages due to technical limitations.
By alphabetical order
* Glossary of engineering: A–L
* Glossary of engineering: M–Z
By category
* Glossary of civil engineering
* Glossary of electrical and e ...
.
The word ''
engineering
Engineering is the practice of using natural science, mathematics, and the engineering design process to Problem solving#Engineering, solve problems within technology, increase efficiency and productivity, and improve Systems engineering, s ...
'' is derived from the
Latin
Latin ( or ) is a classical language belonging to the Italic languages, Italic branch of the Indo-European languages. Latin was originally spoken by the Latins (Italic tribe), Latins in Latium (now known as Lazio), the lower Tiber area aroun ...
.
Definition
The
American Engineers' Council for Professional Development
The American Engineers' Council for Professional Development or simply the Engineers' Council for Professional Development (ECPD), established in June 1932, was an engineering professional body dedicated to the education, accreditation, regulatio ...
(the predecessor of the
Accreditation Board for Engineering and Technology
ABET (pronounced A-bet), formerly known as the Accreditation Board for Engineering and Technology, Inc., is a non-governmental accreditation organization for post-secondary programs in engineering, engineering technology, computing, and appli ...
aka ABET)
has defined "engineering" as:
History

Engineering has existed since ancient times, when
humans devised inventions such as the
wedge,
lever
A lever is a simple machine consisting of a beam (structure), beam or rigid rod pivoted at a fixed hinge, or '':wikt:fulcrum, fulcrum''. A lever is a rigid body capable of rotating on a point on itself. On the basis of the locations of fulcrum, l ...
,
wheel
A wheel is a rotating component (typically circular in shape) that is intended to turn on an axle Bearing (mechanical), bearing. The wheel is one of the key components of the wheel and axle which is one of the Simple machine, six simple machin ...
and
pulley, etc.
The term ''engineering'' is derived from the word ''engineer'', which itself dates back to the 14th century when an ''engine'er'' (literally, one who builds or operates a ''
siege engine'') referred to "a constructor of military engines". In this context, now obsolete, an "engine" referred to a military machine, ''i.e.'', a mechanical contraption used in war (for example, a
catapult). Notable examples of the obsolete usage which have survived to the present day are military engineering corps, ''e.g.'', the
U.S. Army Corps of Engineers.
The word "engine" itself is of even older origin, ultimately deriving from the Latin (), meaning "innate quality, especially mental power, hence a clever invention."
Later, as the design of civilian structures, such as bridges and buildings, matured as a technical discipline, the term
civil engineering
Civil engineering is a regulation and licensure in engineering, professional engineering discipline that deals with the design, construction, and maintenance of the physical and naturally built environment, including public works such as roads ...
entered the lexicon as a way to distinguish between those specializing in the construction of such non-military projects and those involved in the discipline of
military engineering.
Ancient era

The
pyramids in
ancient Egypt
Ancient Egypt () was a cradle of civilization concentrated along the lower reaches of the Nile River in Northeast Africa. It emerged from prehistoric Egypt around 3150BC (according to conventional Egyptian chronology), when Upper and Lower E ...
,
ziggurats of
Mesopotamia
Mesopotamia is a historical region of West Asia situated within the Tigris–Euphrates river system, in the northern part of the Fertile Crescent. Today, Mesopotamia is known as present-day Iraq and forms the eastern geographic boundary of ...
, the
Acropolis
An acropolis was the settlement of an upper part of an ancient Greek city, especially a citadel, and frequently a hill with precipitous sides, mainly chosen for purposes of defense. The term is typically used to refer to the Acropolis of Athens ...
and
Parthenon
The Parthenon (; ; ) is a former Ancient Greek temple, temple on the Acropolis of Athens, Athenian Acropolis, Greece, that was dedicated to the Greek gods, goddess Athena. Its decorative sculptures are considered some of the high points of c ...
in
Greece
Greece, officially the Hellenic Republic, is a country in Southeast Europe. Located on the southern tip of the Balkan peninsula, it shares land borders with Albania to the northwest, North Macedonia and Bulgaria to the north, and Turkey to th ...
, the
Roman aqueducts,
Via Appia and
Colosseum,
Teotihuacán, and the
Brihadeeswarar Temple of
Thanjavur, among many others, stand as a testament to the ingenuity and skill of ancient civil and military engineers. Other monuments, no longer standing, such as the
Hanging Gardens of Babylon and the
Pharos of Alexandria, were important engineering achievements of their time and were considered among the
Seven Wonders of the Ancient World.
The six classic
simple machines were known in the
ancient Near East. The
wedge and the
inclined plane (ramp) were known since
prehistoric times. The
wheel
A wheel is a rotating component (typically circular in shape) that is intended to turn on an axle Bearing (mechanical), bearing. The wheel is one of the key components of the wheel and axle which is one of the Simple machine, six simple machin ...
, along with the
wheel and axle mechanism, was invented in
Mesopotamia
Mesopotamia is a historical region of West Asia situated within the Tigris–Euphrates river system, in the northern part of the Fertile Crescent. Today, Mesopotamia is known as present-day Iraq and forms the eastern geographic boundary of ...
(modern Iraq) during the 5th millennium BC. The
lever
A lever is a simple machine consisting of a beam (structure), beam or rigid rod pivoted at a fixed hinge, or '':wikt:fulcrum, fulcrum''. A lever is a rigid body capable of rotating on a point on itself. On the basis of the locations of fulcrum, l ...
mechanism first appeared around 5,000 years ago in the
Near East
The Near East () is a transcontinental region around the Eastern Mediterranean encompassing the historical Fertile Crescent, the Levant, Anatolia, Egypt, Mesopotamia, and coastal areas of the Arabian Peninsula. The term was invented in the 20th ...
, where it was used in a simple
balance scale
A scale or balance is a device used to measure weight or mass. These are also known as mass scales, weight scales, mass balances, massometers, and weight balances.
The traditional scale consists of two plates or bowls suspended at equal dis ...
,
and to move large objects in
ancient Egyptian technology. The lever was also used in the
shadoof water-lifting device, the first
crane machine, which appeared in Mesopotamia ,
and then in
ancient Egyptian technology . The earliest evidence of
pulleys date back to Mesopotamia in the early 2nd millennium BC,
and
ancient Egypt
Ancient Egypt () was a cradle of civilization concentrated along the lower reaches of the Nile River in Northeast Africa. It emerged from prehistoric Egypt around 3150BC (according to conventional Egyptian chronology), when Upper and Lower E ...
during the
Twelfth Dynasty (1991–1802 BC). The
screw, the last of the simple machines to be invented,
first appeared in Mesopotamia during the
Neo-Assyrian period (911–609) BC.
The
Egyptian pyramids were built using three of the six simple machines, the inclined plane, the wedge, and the lever, to create structures like the
Great Pyramid of Giza.
The earliest civil engineer known by name is
Imhotep.
As one of the officials of the
Pharaoh
Pharaoh (, ; Egyptian language, Egyptian: ''wikt:pr ꜥꜣ, pr ꜥꜣ''; Meroitic language, Meroitic: 𐦲𐦤𐦧, ; Biblical Hebrew: ''Parʿō'') was the title of the monarch of ancient Egypt from the First Dynasty of Egypt, First Dynasty ( ...
,
Djosèr, he probably designed and supervised the construction of the
Pyramid of Djoser (the
Step Pyramid) at
Saqqara in Egypt around 2630–2611 BC.
The earliest practical
water-powered machines, the
water wheel
A water wheel is a machine for converting the kinetic energy of flowing or falling water into useful forms of power, often in a watermill. A water wheel consists of a large wheel (usually constructed from wood or metal), with numerous b ...
and
watermill
A watermill or water mill is a mill that uses hydropower. It is a structure that uses a water wheel or water turbine to drive a mechanical process such as mill (grinding), milling (grinding), rolling, or hammering. Such processes are needed in ...
, first appeared in the
Persian Empire
The Achaemenid Empire or Achaemenian Empire, also known as the Persian Empire or First Persian Empire (; , , ), was an Iranian empire founded by Cyrus the Great of the Achaemenid dynasty in 550 BC. Based in modern-day Iran, it was the larg ...
, in what are now Iraq and Iran, by the early 4th century BC.
Kush
KUSH 1600 AM is a radio station licensed to Cushing, Oklahoma. The station broadcasts a Full service format, consisting of local and national talk, sports
Sport is a physical activity or game, often competitive and organized, tha ...
developed the
Sakia during the 4th century BC, which relied on animal power instead of human energy.
Hafirs were developed as a type of
reservoir
A reservoir (; ) is an enlarged lake behind a dam, usually built to water storage, store fresh water, often doubling for hydroelectric power generation.
Reservoirs are created by controlling a watercourse that drains an existing body of wa ...
in Kush to store and contain water as well as boost irrigation.
[Fritz Hintze, Kush XI; pp. 222–224.] Sappers were employed to build
causeways during military campaigns. Kushite ancestors built
speos during the Bronze Age between 3700 and 3250 BC.
Bloomeries and
blast furnaces were also created during the 7th centuries BC in Kush.
Ancient Greece
Ancient Greece () was a northeastern Mediterranean civilization, existing from the Greek Dark Ages of the 12th–9th centuries BC to the end of classical antiquity (), that comprised a loose collection of culturally and linguistically r ...
developed machines in both civilian and military domains. The
Antikythera mechanism, an early known mechanical
analog computer
An analog computer or analogue computer is a type of computation machine (computer) that uses physical phenomena such as Electrical network, electrical, Mechanics, mechanical, or Hydraulics, hydraulic quantities behaving according to the math ...
, and the mechanical
inventions
An invention is a unique or novel device, method, composition, idea, or process. An invention may be an improvement upon a machine, product, or process for increasing efficiency or lowering cost. It may also be an entirely new concept. If an ...
of
Archimedes
Archimedes of Syracuse ( ; ) was an Ancient Greece, Ancient Greek Greek mathematics, mathematician, physicist, engineer, astronomer, and Invention, inventor from the ancient city of Syracuse, Sicily, Syracuse in History of Greek and Hellenis ...
, are examples of Greek mechanical engineering. Some of Archimedes' inventions, as well as the Antikythera mechanism, required sophisticated knowledge of
differential gearing or
epicyclic gearing, two key principles in machine theory that helped design the
gear trains of the Industrial Revolution, and are widely used in fields such as
robotics
Robotics is the interdisciplinary study and practice of the design, construction, operation, and use of robots.
Within mechanical engineering, robotics is the design and construction of the physical structures of robots, while in computer s ...
and
automotive engineering.
Ancient Chinese, Greek, Roman and
Hunnic armies employed military machines and inventions such as
artillery
Artillery consists of ranged weapons that launch Ammunition, munitions far beyond the range and power of infantry firearms. Early artillery development focused on the ability to breach defensive walls and fortifications during sieges, and l ...
which was developed by the Greeks around the 4th century BC, the
trireme
A trireme ( ; ; cf. ) was an ancient navies and vessels, ancient vessel and a type of galley that was used by the ancient maritime civilizations of the Mediterranean Sea, especially the Phoenicians, ancient Greece, ancient Greeks and ancient R ...
, the
ballista and the
catapult, the
trebuchet by Chinese circa 6th-5th century BCE.
Middle Ages
The earliest practical
wind-powered machines, the
windmill and
wind pump, first appeared in the
Muslim world
The terms Islamic world and Muslim world commonly refer to the Islamic community, which is also known as the Ummah. This consists of all those who adhere to the religious beliefs, politics, and laws of Islam or to societies in which Islam is ...
during the
Islamic Golden Age
The Islamic Golden Age was a period of scientific, economic, and cultural flourishing in the history of Islam, traditionally dated from the 8th century to the 13th century.
This period is traditionally understood to have begun during the reign o ...
, in what are now Iran, Afghanistan, and Pakistan, by the 9th century AD. The earliest practical
steam-powered machine was a
steam jack driven by a
steam turbine, described in 1551 by
Taqi al-Din Muhammad ibn Ma'ruf in
Ottoman Egypt.
The
cotton gin
A cotton gin—meaning "cotton engine"—is a machine that quickly and easily separates cotton fibers from their seeds, enabling much greater productivity than manual cotton separation.. Reprinted by McGraw-Hill, New York and London, 1926 (); ...
was invented in India by the 6th century AD, and the
spinning wheel was invented in the
Islamic world
The terms Islamic world and Muslim world commonly refer to the Islamic community, which is also known as the Ummah. This consists of all those who adhere to the religious beliefs, politics, and laws of Islam or to societies in which Islam is ...
by the early 11th century,
both of which were fundamental to the growth of the
cotton industry. The spinning wheel was also a precursor to the
spinning jenny, which was a key development during the early
Industrial Revolution
The Industrial Revolution, sometimes divided into the First Industrial Revolution and Second Industrial Revolution, was a transitional period of the global economy toward more widespread, efficient and stable manufacturing processes, succee ...
in the 18th century.
The earliest
programmable machines were developed in the Muslim world. A
music sequencer, a programmable
musical instrument
A musical instrument is a device created or adapted to make Music, musical sounds. In principle, any object that produces sound can be considered a musical instrument—it is through purpose that the object becomes a musical instrument. A person ...
, was the earliest type of programmable machine. The first music sequencer was an automated
flute player invented by the
Banu Musa brothers, described in their ''
Book of Ingenious Devices'', in the 9th century.
In 1206, Al-Jazari invented programmable
automata/
robot
A robot is a machine—especially one Computer program, programmable by a computer—capable of carrying out a complex series of actions Automation, automatically. A robot can be guided by an external control device, or the robot control, co ...
s. He described four
automaton
An automaton (; : automata or automatons) is a relatively self-operating machine, or control mechanism designed to automatically follow a sequence of operations, or respond to predetermined instructions. Some automata, such as bellstrikers i ...
musicians, including drummers operated by a programmable
drum machine
A drum machine is an electronic musical instrument that creates percussion sounds, drum beats, and patterns. Drum machines may imitate drum kits or other percussion instruments, or produce unique sounds, such as synthesized electronic tones. A d ...
, where they could be made to play different rhythms and different drum patterns.
[Professor Noel Sharkey]
A 13th Century Programmable Robot (Archive)
University of Sheffield
The University of Sheffield (informally Sheffield University or TUOS) is a public university, public research university in Sheffield, South Yorkshire, England. Its history traces back to the foundation of Sheffield Medical School in 1828, Fir ...
.

Before the development of modern engineering, mathematics was used by artisans and craftsmen, such as
millwrights,
clockmakers, instrument makers and surveyors. Aside from these professions, universities were not believed to have had much practical significance to technology.
A standard reference for the state of mechanical arts during the Renaissance is given in the mining engineering treatise ''
De re metallica'' (1556), which also contains sections on geology, mining, and chemistry. ''De re metallica'' was the standard chemistry reference for the next 180 years.
Modern era
The science of
classical mechanics
Classical mechanics is a Theoretical physics, physical theory describing the motion of objects such as projectiles, parts of Machine (mechanical), machinery, spacecraft, planets, stars, and galaxies. The development of classical mechanics inv ...
, sometimes called Newtonian mechanics, formed the scientific basis of much of modern engineering.
With the rise of engineering as a
profession
A profession is a field of Work (human activity), work that has been successfully professionalized. It can be defined as a disciplined group of individuals, professionals, who adhere to ethical standards and who hold themselves out as, and are ...
in the 18th century, the term became more narrowly applied to fields in which mathematics and science were applied to these ends. Similarly, in addition to military and civil engineering, the fields then known as the
mechanic arts became incorporated into engineering.
Canal
Canals or artificial waterways are waterways or engineered channels built for drainage management (e.g. flood control and irrigation) or for conveyancing water transport vehicles (e.g. water taxi). They carry free, calm surface ...
building was an important engineering work during the early phases of the
Industrial Revolution
The Industrial Revolution, sometimes divided into the First Industrial Revolution and Second Industrial Revolution, was a transitional period of the global economy toward more widespread, efficient and stable manufacturing processes, succee ...
.
John Smeaton was the first self-proclaimed civil engineer and is often regarded as the "father" of civil engineering. He was an English civil engineer responsible for the design of
bridge
A bridge is a structure built to Span (engineering), span a physical obstacle (such as a body of water, valley, road, or railway) without blocking the path underneath. It is constructed for the purpose of providing passage over the obstacle, whi ...
s, canals,
harbors, and
lighthouses. He was also a capable
mechanical engineer
Mechanical may refer to:
Machine
* Machine (mechanical), a system of mechanisms that shape the actuator input to achieve a specific application of output forces and movement
* Mechanical calculator, a device used to perform the basic operations o ...
and an eminent
physicist
A physicist is a scientist who specializes in the field of physics, which encompasses the interactions of matter and energy at all length and time scales in the physical universe. Physicists generally are interested in the root or ultimate cau ...
. Using a model water wheel, Smeaton conducted experiments for seven years, determining ways to increase efficiency.
Smeaton introduced iron axles and gears to water wheels.
Smeaton also made mechanical improvements to the
Newcomen steam engine. Smeaton designed the third
Eddystone Lighthouse (1755–59) where he pioneered the use of '
hydraulic lime
Hydraulic lime (HL) is a general term for a variety of lime different from calcium oxide (quicklime), that sets by hydration and consists of calcium silicate and calcium aluminate, compounds that can harden in contact with water. This contras ...
' (a form of
mortar which will set under water) and developed a technique involving dovetailed blocks of granite in the building of the lighthouse. He is important in the history, rediscovery of, and development of modern
cement, because he identified the compositional requirements needed to obtain "hydraulicity" in lime; work which led ultimately to the invention of Portland cement.
Applied science led to the development of the steam engine. The sequence of events began with the invention of the barometer and the measurement of atmospheric pressure by Evangelista Torricelli in 1643, demonstration of the force of atmospheric pressure by Otto von Guericke using the Magdeburg hemispheres in 1656, laboratory experiments by Denis Papin, who built experimental model steam engines and demonstrated the use of a piston, which he published in 1707. Edward Somerset, 2nd Marquess of Worcester published a book of 100 inventions containing a method for raising waters similar to a coffee percolator. Samuel Morland, a mathematician and inventor who worked on pumps, left notes at the Vauxhall Ordinance Office on a steam pump design that Thomas Savery read. In 1698 Savery built a steam pump called "The Miner's Friend". It employed both vacuum and pressure. Iron merchant Thomas Newcomen, who built the first commercial piston steam engine in 1712, was not known to have any scientific training.

The application of steam-powered cast iron blowing cylinders for providing pressurized air for
blast furnaces lead to a large increase in iron production in the late 18th century. The higher furnace temperatures made possible with steam-powered blast allowed for the use of more lime in
blast furnaces, which enabled the transition from charcoal to coke (fuel), coke. These innovations lowered the cost of iron, making Wagonway, horse railways and iron bridges practical. The puddling process, patented by Henry Cort in 1784 produced large scale quantities of wrought iron. Hot blast, patented by James Beaumont Neilson in 1828, greatly lowered the amount of fuel needed to smelt iron. With the development of the high pressure steam engine, the power to weight ratio of steam engines made practical steamboats and locomotives possible.
New steel making processes, such as the Bessemer process and the open hearth furnace, ushered in an area of heavy engineering in the late 19th century.
One of the most famous engineers of the mid-19th century was Isambard Kingdom Brunel, who built railroads, dockyards and steamships.

The
Industrial Revolution
The Industrial Revolution, sometimes divided into the First Industrial Revolution and Second Industrial Revolution, was a transitional period of the global economy toward more widespread, efficient and stable manufacturing processes, succee ...
created a demand for machinery with metal parts, which led to the development of several machine tools. Boring cast iron cylinders with precision was not possible until John Wilkinson (industrialist), John Wilkinson invented his John Wilkinson (industrialist)#Boring machine for steam engines, boring machine, which is considered the first machine tool. Other machine tools included the screw cutting lathe, milling machine, turret lathe and the Planer (metalworking), metal planer. Precision machining techniques were developed in the first half of the 19th century. These included the use of gigs to guide the machining tool over the work and fixtures to hold the work in the proper position. Machine tools and machining techniques capable of producing interchangeable parts lead to Mass production, large scale factory production by the late 19th century.
The United States Census of 1850 listed the occupation of "engineer" for the first time with a count of 2,000. There were fewer than 50 engineering graduates in the U.S. before 1865. The first PhD in engineering (technically, ''applied science and engineering'') awarded in the United States went to Josiah Willard Gibbs at Yale University in 1863; it was also the second PhD awarded in science in the U.S. In 1870 there were a dozen U.S. mechanical engineering graduates, with that number increasing to 43 per year in 1875. In 1890, there were 6,000 engineers in civil, mining, mechanical and electrical.
There was no chair of applied mechanism and applied mechanics at Cambridge until 1875, and no chair of engineering at Oxford until 1907. Germany established technical universities earlier.
The foundations of electrical engineering in the 1800s included the experiments of Alessandro Volta, Michael Faraday, Georg Ohm and others and the invention of the electric telegraph in 1816 and the electric motor in 1872. The theoretical work of James Clerk Maxwell, James Maxwell (see: Maxwell's equations) and Heinrich Hertz in the late 19th century gave rise to the field of
electronics
Electronics is a scientific and engineering discipline that studies and applies the principles of physics to design, create, and operate devices that manipulate electrons and other Electric charge, electrically charged particles. It is a subfield ...
. The later inventions of the vacuum tube and the transistor further accelerated the development of electronics to such an extent that electrical and electronics engineers currently outnumber their colleagues of any other engineering specialty.
Chemical engineering developed in the late nineteenth century.
Industrial scale manufacturing demanded new materials and new processes and by 1880 the need for large scale production of chemicals was such that a new industry was created, dedicated to the development and large scale manufacturing of chemicals in new industrial plants.
The role of the chemical engineer was the design of these chemical plants and processes.
Originally deriving from the manufacture of ceramics and its putative derivative metallurgy, materials science is one of the oldest forms of engineering.
Modern materials science evolved directly from metallurgy, which itself evolved from the use of fire. Important elements of modern materials science were products of the Space Race; the understanding and engineering of the metallic alloys, and silica and carbon materials, used in building space vehicles enabling the exploration of space. Materials science has driven, and been driven by, the development of revolutionary technologies such as rubbers, plastics, semiconductors, and biomaterials.

Aeronautical engineering deals with aircraft design process design while aerospace engineering is a more modern term that expands the reach of the discipline by including spacecraft design. Its origins can be traced back to the aviation pioneers around the start of the 20th century although the work of Sir George Cayley has recently been dated as being from the last decade of the 18th century. Early knowledge of aeronautical engineering was largely empirical with some concepts and skills imported from other branches of engineering.
Only a decade after the successful flights by the Wright brothers, there was extensive development of aeronautical engineering through development of military aircraft that were used in World War I. Meanwhile, research to provide fundamental background science continued by combining theoretical physics with experiments.
Branches of engineering

Engineering is a broad discipline that is often broken down into several sub-disciplines. Although most engineers will usually be trained in a specific discipline, some engineers become multi-disciplined through experience. Engineering is often characterized as having five main branches:
[The Engineering Profession](_blank)
by Sir James Hamilton, UK Engineering Council Quote: "The Civilingenior degree encompasses the main branches of engineering civil, mechanical, electrical, chemical." (From the Internet Archive) chemical engineering, civil engineering, electrical engineering, materials science and engineering, and mechanical engineering.
Below is a list of recognized branches of engineering. There are additional sub-disciplines as well.
Interdisciplinary engineering
Interdisciplinary engineering draws from more than one of the principle branches of the practice. Historically, naval engineering and mining engineering were major branches. Other engineering fields are manufacturing engineering, acoustical engineering, corrosion engineering, instrumentation and control, Automotive engineering, automotive, information engineering, petroleum engineering, petroleum, systems engineering, systems, audio engineering, audio, software engineering, software, architectural engineering, architectural, biosystems engineering, biosystems, and Textile manufacturing, textile nuclear engineering, engineering. These and other branches of engineering are represented in the 36 licensed member institutions of the UK Engineering Council.
New specialties sometimes combine with the traditional fields and form new branches – for example, Earth systems engineering and management involves a wide range of subject areas including engineering studies, environmental science, engineering ethics and philosophy of engineering.
Practice
One who practices engineering is called an engineer, and those licensed to do so may have more formal designations such as Professional Engineer, Chartered Engineer, Incorporated Engineer, Ingenieur, European Engineer, or Federal Aviation Administration#Designated Engineering Representative (DER), Designated Engineering Representative.
Methodology

In the engineering design process, engineers apply mathematics and sciences such as physics to find novel solutions to problems or to improve existing solutions. Engineers need proficient knowledge of relevant sciences for their design projects. As a result, many engineers continue to learn new material throughout their careers.
If multiple solutions exist, engineers weigh each design choice based on their merit and choose the solution that best matches the requirements. The task of the engineer is to identify, understand, and interpret the constraints on a design in order to yield a successful result. It is generally insufficient to build a technically successful product, rather, it must also meet further requirements.
Constraints may include available resources, physical, imaginative or technical limitations, flexibility for future modifications and additions, and other factors, such as requirements for cost, Safety engineering, safety, marketability, productivity, and Serviceability (computer), serviceability. By understanding the constraints, engineers derive specifications for the limits within which a viable object or system may be produced and operated.
Problem solving

Engineers use their knowledge of science,
mathematics
Mathematics is a field of study that discovers and organizes methods, Mathematical theory, theories and theorems that are developed and Mathematical proof, proved for the needs of empirical sciences and mathematics itself. There are many ar ...
, logic, economics, and empirical knowledge, appropriate experience or tacit knowledge to find suitable solutions to a particular problem. Creating an appropriate mathematical model of a problem often allows them to analyze it (sometimes definitively), and to test potential solutions.
More than one solution to a design problem usually exists so the different design choices have to be evaluated on their merits before the one judged most suitable is chosen. Genrich Altshuller, after gathering statistics on a large number of patents, suggested that compromises are at the heart of "level of invention, low-level" engineering designs, while at a higher level the best design is one which eliminates the core contradiction causing the problem.
Engineers typically attempt to predict how well their designs will perform to their specifications prior to full-scale production. They use, among other things: prototypes, scale models, simulations, destructive testing, destructive tests, nondestructive testing, nondestructive tests, and stress testing, stress tests. Testing ensures that products will perform as expected but only in so far as the testing has been representative of use in service. For products, such as aircraft, that are used differently by different users failures and unexpected shortcomings (and necessary design changes) can be expected throughout the operational life of the product.
Engineers take on the responsibility of producing designs that will perform as well as expected and, except those employed in specific areas of the arms industry, will not harm people. Engineers typically include a factor of safety in their designs to reduce the risk of unexpected failure.
The study of failed products is known as forensic engineering. It attempts to identify the cause of failure to allow a redesign of the product and so prevent a re-occurrence. Careful analysis is needed to establish the cause of failure of a product. The consequences of a failure may vary in severity from the minor cost of a machine breakdown to large loss of life in the case of accidents involving aircraft and large stationary structures like buildings and dams.
Computer use

As with all modern scientific and technological endeavors, computers and software play an increasingly important role. As well as the typical business application software there are a number of computer aided applications (computer-aided technologies) specifically for engineering. Computers can be used to generate models of fundamental physical processes, which can be solved using numerical methods.

One of the most widely used design tools in the profession is computer-aided design (CAD) software. It enables engineers to create 3D models, 2D drawings, and schematics of their designs. CAD together with digital mockup (DMU) and Computer-aided engineering, CAE software such as Finite element method, finite element method analysis or analytic element method allows engineers to create models of designs that can be analyzed without having to make expensive and time-consuming physical prototypes.
These allow products and components to be checked for flaws; assess fit and assembly; study ergonomics; and to analyze static and dynamic characteristics of systems such as stresses, temperatures, electromagnetic emissions, electrical currents and voltages, digital logic levels, fluid flows, and kinematics. Access and distribution of all this information is generally organized with the use of product data management software.
There are also many tools to support specific engineering tasks such as computer-aided manufacturing (CAM) software to generate CNC machining instructions; manufacturing process management software for production engineering; Electronic design automation, EDA for printed circuit board (PCB) and circuit schematics for electronic engineers; Maintenance, repair, and operations, MRO applications for maintenance management; and Architecture, engineering and construction (AEC) software for civil engineering.
In recent years the use of computer software to aid the development of goods has collectively come to be known as product lifecycle management (PLM).
Social context

The engineering profession engages in a range of activities, from collaboration at the societal level, and smaller individual projects. Almost all engineering projects are obligated to a funding source: a company, a set of investors, or a government. The types of engineering that are less constrained by such a funding source, are ''pro bono'', and open-design engineering.
Engineering has interconnections with society, culture and human behavior. Most products and constructions used by modern society, are influenced by engineering. Engineering activities have an impact on the environment, society, economies, and public safety.
Engineering projects can be controversial. Examples from different engineering disciplines include: the development of nuclear weapons, the Three Gorges Dam, the design and use of sport utility vehicles and the extraction of Fuel oil, oil. In response, some engineering companies have enacted serious Corporate social responsibility, corporate and social responsibility policies.
The attainment of many of the Millennium Development Goals requires the achievement of sufficient engineering capacity to develop infrastructure and sustainable technological development.

Overseas development and relief NGOs make considerable use of engineers, to apply solutions in disaster and development scenarios. Some charitable organizations use engineering directly for development:
* Engineers Without Borders
* Engineers Against Poverty
* Registered Engineers for Disaster Relief
* Engineers for a Sustainable World
* Engineering for Change
* Engineering Ministries International
[Home page for EMI](_blank)
Engineering companies in more developed economies face challenges with regard to the number of engineers being trained, compared with those retiring. This problem is prominent in the UK where engineering has a poor image and low status. There are negative economic and political issues that this can cause, as well as ethical issues. It is agreed the engineering profession faces an "image crisis". The UK holds the :Engineering companies by country, most engineering companies compared to other European countries, together with the United States.
Code of ethics
Many engineering societies have established codes of practice and engineering ethics, codes of ethics to guide members and inform the public at large. The National Society of Professional Engineers code of ethics states:
In Canada, engineers wear the Iron Ring as a symbol and reminder of the obligations and ethics associated with their profession.
Relationships with other disciplines
Science

There exists an overlap between the sciences and engineering practice; in engineering, one applies science. Both areas of endeavor rely on accurate observation of materials and phenomena. Both use mathematics and classification criteria to analyze and communicate observations.
Scientists may also have to complete engineering tasks, such as designing experimental apparatus or building prototypes. Conversely, in the process of developing technology, engineers sometimes find themselves exploring new phenomena, thus becoming, for the moment, scientists or more precisely "engineering scientists".
In the book ''What Engineers Know and How They Know It'',
Walter Vincenti asserts that engineering research has a character different from that of scientific research. First, it often deals with areas in which the basic physics or chemistry are well understood, but the problems themselves are too complex to solve in an exact manner.
There is a "real and important" difference between engineering and physics as similar to any science field has to do with technology. Physics is an exploratory science that seeks knowledge of principles while engineering uses knowledge for practical applications of principles. The former equates an understanding into a mathematical principle while the latter measures variables involved and creates technology. For technology, physics is an auxiliary and in a way technology is considered as applied physics. Though physics and engineering are interrelated, it does not mean that a physicist is trained to do an engineer's job. A physicist would typically require additional and relevant training. Physicists and engineers engage in different lines of work. But PhD physicists who specialize in sectors of engineering physics and applied physics are titled as Technology officer, R&D Engineers and System Engineers.
An example of this is the use of numerical approximations to the Navier–Stokes equations to describe aerodynamic flow over an aircraft, or the use of the finite element method to calculate the stresses in complex components. Second, engineering research employs many semi-empirical methods that are foreign to pure scientific research, one example being the method of parameter variation.
As stated by Fung ''et al.'' in the revision to the classic engineering text ''Foundations of Solid Mechanics'':
Engineering is quite different from science. Scientists try to understand nature. Engineers try to make things that do not exist in nature. Engineers stress innovation and invention. To embody an invention the engineer must put his idea in concrete terms, and design something that people can use. That something can be a complex system, device, a gadget, a material, a method, a computing program, an innovative experiment, a new solution to a problem, or an improvement on what already exists. Since a design has to be realistic and functional, it must have its geometry, dimensions, and characteristics data defined. In the past engineers working on new designs found that they did not have all the required information to make design decisions. Most often, they were limited by insufficient scientific knowledge. Thus they studied mathematics
Mathematics is a field of study that discovers and organizes methods, Mathematical theory, theories and theorems that are developed and Mathematical proof, proved for the needs of empirical sciences and mathematics itself. There are many ar ...
, physics, chemistry, biology and mechanics. Often they had to add to the sciences relevant to their profession. Thus engineering sciences were born.
Although engineering solutions make use of scientific principles, engineers must also take into account safety, efficiency, economy, reliability, and constructability or ease of fabrication as well as the environment, ethical and legal considerations such as patent infringement or liability in the case of failure of the solution.
Medicine and biology

The study of the human body, albeit from different directions and for different purposes, is an important common link between medicine and some engineering disciplines. Medicine aims to sustain, repair, enhance and even replace functions of the human body, if necessary, through the use of
technology
Technology is the application of Conceptual model, conceptual knowledge to achieve practical goals, especially in a reproducible way. The word ''technology'' can also mean the products resulting from such efforts, including both tangible too ...
.

Modern medicine can replace several of the body's functions through the use of artificial organs and can significantly alter the function of the human body through artificial devices such as, for example, brain implants and pacemakers.
The fields of bionics and medical bionics are dedicated to the study of synthetic implants pertaining to natural systems.
Conversely, some engineering disciplines view the human body as a biological machine worth studying and are dedicated to emulating many of its functions by replacing biology with technology. This has led to fields such as artificial intelligence, Artificial neural network, neural networks, fuzzy logic, and
robot
A robot is a machine—especially one Computer program, programmable by a computer—capable of carrying out a complex series of actions Automation, automatically. A robot can be guided by an external control device, or the robot control, co ...
ics. There are also substantial interdisciplinary interactions between engineering and medicine.
[Institute of Medicine and Engineering: Mission statement The mission of the Institute for Medicine and Engineering (IME) is to stimulate fundamental research at the interface between biomedicine and engineering/physical/computational sciences leading to innovative applications in biomedical research and clinical practice.](_blank)
Both fields provide solutions to real world problems. This often requires moving forward before phenomena are completely understood in a more rigorous scientific sense and therefore experimentation and empirical knowledge is an integral part of both.
Medicine, in part, studies the function of the human body. The human body, as a biological machine, has many functions that can be modeled using engineering methods.
[Royal Academy of Engineering and Academy of Medical Sciences: Systems Biology: a vision for engineering and medicine in pdf: quote1: Systems Biology is an emerging methodology that has yet to be defined quote2: It applies the concepts of systems engineering to the study of complex biological systems through iteration between computational or mathematical modelling and experimentation.](_blank)
The heart for example functions much like a pump,
the skeleton is like a linked structure with levers,
the brain produces Signal (electrical engineering), electrical signals etc.
These similarities as well as the increasing importance and application of engineering principles in medicine, led to the development of the field of biomedical engineering that uses concepts developed in both disciplines.
Newly emerging branches of science, such as systems biology, are adapting analytical tools traditionally used for engineering, such as systems modeling and computational analysis, to the description of biological systems.
Art

There are connections between engineering and art, for example, architecture, landscape architecture and industrial design (even to the extent that these disciplines may sometimes be included in a university's Faculty (division), Faculty of Engineering).
[MIT World:The Art of Engineering: Inventor James Dyson on the Art of Engineering: quote: A member of the British Design Council, James Dyson has been designing products since graduating from the Royal College of Art in 1970.](_blank)
The Art Institute of Chicago, for instance, held an exhibition about the art of NASA's aerospace design.
Robert Maillart's bridge design is perceived by some to have been deliberately artistic.
At the University of South Florida, an engineering professor, through a grant with the National Science Foundation, has developed a course that connects art and engineering.
[quote:..the tools of artists and the perspective of engineers..](_blank)
Among famous historical figures, Leonardo da Vinci is a well-known Renaissance artist and engineer, and a prime example of the nexus between art and engineering.
[Bjerklie, David. "The Art of Renaissance Engineering." ''MIT's Technology Review'' Jan./Feb.1998: 54–59. Article explores the concept of the "artist-engineer", an individual who used his artistic talent in engineering. Quote from article: Da Vinci reached the pinnacle of "artist-engineer"-dom, Quote2: "It was Leonardo da Vinci who initiated the most ambitious expansion in the role of artist-engineer, progressing from astute observer to inventor to theoretician." (Bjerklie 58)][Drew U: user website: cites Bjerklie paper](_blank)
Business
Business engineering deals with the relationship between professional engineering, IT systems, business administration and change management. Engineering management or "Management engineering" is a specialized field of management concerned with engineering practice or the engineering industry sector. The demand for management-focused engineers (or from the opposite perspective, managers with an understanding of engineering), has resulted in the development of specialized engineering management degrees that develop the knowledge and skills needed for these roles. During an engineering management course, students will develop industrial engineering skills, knowledge, and expertise, alongside knowledge of business administration, management techniques, and strategic thinking. Engineers specializing in change management must have in-depth knowledge of the application of industrial and organizational psychology principles and methods. Professional engineers often train as certified management consultants in the very specialized field of management consulting applied to engineering practice or the engineering sector. This work often deals with large scale complex business transformation or business process management initiatives in aerospace and defence, automotive, oil and gas, machinery, pharmaceutical, food and beverage, electrical and electronics, power distribution and generation, utilities and transportation systems. This combination of technical engineering practice, management consulting practice, industry sector knowledge, and change management expertise enables professional engineers who are also qualified as management consultants to lead major business transformation initiatives. These initiatives are typically sponsored by C-level executives.
Other fields
In political science, the term ''engineering'' has been borrowed for the study of the subjects of Social engineering (political science), social engineering and political engineering, which deal with forming political structure, political and social structures using engineering methodology coupled with political science principles. Marketing engineering and financial engineering have similarly borrowed the term.
See also
;Lists
* List of aerospace engineering topics
* List of basic chemical engineering topics
* List of electrical engineering topics
* List of engineering societies
* List of engineering topics
* List of engineers
* List of genetic engineering topics
* List of mechanical engineering topics
* List of nanoengineering topics
* List of software engineering topics
;Glossaries
* Glossary of areas of mathematics
* Glossary of biology
* Glossary of chemistry
* Glossary of engineering
* Glossary of physics
;Related subjects
* Controversies over the term Engineer
* Design
* Earthquake engineering
* Engineer
* Engineering economics
* Engineering education
* Engineering education research
* Environmental engineering science
* Global Engineering Education
* Green engineering
* Reverse engineering
* Structural failure
* Sustainable engineering
* Women in engineering
References
Further reading
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Engineering,
Engineering occupations
Philosophy of science
Main topic articles