This project began with the delineation of the roles and functions of respiratory therapy personnel by the American Association for Respiratory Therapy. In Phase II, The Psychological Corporation used this delineation to develop six proficiency examinations, three at each of two levels. One exam at each level was designated for the purpose of the validation process. Statistical analysis included the means and standard deviation of the two tests, correlation of scores between these tests and the Certification Examinations and Written Registry Examinations, and an item analysis of the two tests. In retrospect, the original delineation of roles did not provide sufficient behavioral specificity for the derivation of criterion referenced examinations. At this time, a project to"define" respiratory therapy competence is in development to supplant the original delineation of roles document. This definition will then be used as a basis for developing at least one evaluative simulation as a possible alternative assessment form within the credentialing system. (Author/BW)