This study explored the validity and potential utility for self-assessment of speaking proficiency in English as a second language (ESL), of a self-rating scale intended to nominally parallel--in terms of number of points or levels and corresponding descriptions oflanguage-use behavior--a scale used by members of the Interagency Language Roundtable (ILR) to rate performance in Language Proficiency Interviews (LPI). The study sample was composed primarily of educated, adult ESL users/learners, most of whom were native-speakers of either French or German, who provided self-assessments just prior to taking the Test of English for International Communication (TOEIC), in employment-related ESL training contexts in Switzerland. Correlations between self-ratings and TOEIC scores centered around .7, and the mean ILRreferenced self-rating was very close to that for "predicted ILR-scaled LPI rating", where prediction was based on a previously developed equation for predicting LPI rating from TOEIC score. Lines of inquiry warranting further research are suggested.