The Expanded Graded Intergenerational Disruption Scale (EGIDS), developed by Lewis and Simons (2010), measures a language's status in terms of

endangerment Endangerment is a type of crime involving conduct that is wrongful and reckless or wanton, and likely to produce death or grievous bodily harm to another person. There are several kinds of endangerment, each of which is a criminal act that can ...

or development.
The table below shows the various levels on the scale: The EGIDS model has become widely known, cited in 555 publications as of August 2021.

References

{{Reflist Endangered languages 2010 introductions 2010 in science