ILR scale - Wikipedia
en.wikipedia.org › wiki › ILR_scaleILR scale. The Interagency Language Roundtable scale is a set of descriptions of abilities to communicate in a language. It is the standard grading scale for language proficiency in the United States 's Federal-level service. It was originally developed by the Interagency Language Roundtable (ILR), which included representation by United States Foreign Service Institute, the predecessor of the National Foreign Affairs Training Center (NFATC).