PICO process

The PICO process (or framework) is a mnemonic used in evidence-based practice (and specifically evidence-based medicine) to frame and answer a clinical or health care related question, though it is also argued that PICO "can be used universally for every scientific endeavour in any discipline with all study designs". The PICO framework is also used to develop literature search strategies, for instance in systematic reviews.

The PICO acronym has come to stand for:

* PPatient, problem or population
* IIntervention
* CComparison, control or comparator
* OOutcome(s) (e.g. pain, fatigue, nausea, infections, death)

An application that covers clinical questions about interventions, as well as exposures, risk/ prognostic factors, and test accuracy, is:
* PPatient, problem or population
* IInvestigated condition (e.g. intervention, exposure, risk/ prognostic factor, or test result)
* CComparison condition (e.g. intervention, exposure, risk/ prognostic factor, or test result respectively)
* OOutcome(s) (e.g. symptom, syndrome, or disease of interest)

Alternatives such as SPICE and PECO (among many others) can also be used. Some authors suggest adding T and S, as follows:

* T - Timing (e.g. duration of intervention, or date of publication)
* S - Study type (e.g. randomized controlled trial, cohort study, etc.)

PICO as a universal technique

It was argued that PICO may be useful for every scientific endeavor even beyond clinical settings. This proposal is based on a more abstract view of the PICO mnemonic, equating them with four components that is inherent to every single research, namely (1) research object; (2) application of a theory or method; (3) alternative theories or methods (or the null hypothesis