Alternative approaches to the measurement of adaptive behavior.

Most measures of adaptive behavior are derived from rating scales. There are only a few instruments that approach the measurement of adaptive behavior through direct testing. In the present study we examined the relative efficacy of rating and testing approaches for predicting criterion behavior. Three tests from the Social and Prevocational Information Battery were selected as a foundation for the development of analogous behavior-rating and applied-performance instruments. All three types of instruments were administered to the same subjects, mildly retarded adolescents, in order to estimate the validity of testing and rating approaches. Although both approaches were found to be valid, the testing approach appeared to be substantially superior. Implications of this finding were discussed briefly.