The aim of this study was to develop a case-finding tool enabling the identification of residential care facilities that provide inadequate care to impaired older persons and assess its validity. This was done using data from a recent study that involved 88 homes for the aged located in the Eastern Townships of Quebec. For that study, facility managers were interviewed for information about themselves and their residence, while quality of care was assessed with the QUALCAEE Scale for each of 301 residents of the selected homes. Multivariate regression analyses helped develop a short questionnaire that can be completed during a telephone interview with the facility manager. With 85 per cent sensitivity and 65 per cent specificity in identifying homes delivering inadequate care, this case-finding questionnaire is simple, inexpensive and shows good evidence of validity.