Under the guidance of an advisory committee from the American Association for Respiratory Therapy (AART), The Psychological Corporation developed three forms of two criterion-referenced proficiency examinations to measure the skills, understandings, and knowledge required in entry level jobs for two levels of respiratory therapy personnel. The examinations were based on the results of an earlier project which had outlined the specific content and work specifications of the two levels. The three forms of the two examinations were administered to a pretest/norming sample composed of students preparing for practice at the two levels and personnel seeking present credentials at the two levels. The small size of the samples precluded the drawing of conclusions, and further study is recommended. The advisory committee also developed a proposal for a credentialing strategy in relation to the use of the tests. (Author/BW)