Expanded Graded Intergenerational Disruption Scale

The Expanded Graded Intergenerational Disruption Scale (EGIDS), developed by Lewis and Simons (2010) as an expansion of Joshua Fishman's GIDS, measures a language's status in terms of endangerment or development.

The table below shows the various levels on the scale:

Fishman's GIDS had levels 1 to 8. EGIDS adds levels 0, 9 and 10, and splits Fishman's levels 6 and 8 into two parts each.

The EGIDS model has become widely known, cited in 911 publications as of May 2025.

This model was developed for spoken languages. It has also been adapted for use with sign languages.