This instrument, developed and field-tested since February 1969, can be used to describe teacher behaviors during classroom teaching, planning, and evaluation and diagnosis. It is designed for use by a team of clinicians, the number depending on the purpose for which the instrument is used, e.g., to develop teacher descriptions for use in certification, employment, or tenure; to assist in establishing a differentiated staff; to aid in supervising students and intern teachers; to identify points of weakness in curriculum and behavior. The instrument contains specific items for behavior under each category and sub-category: (1) Teaching (General Techniques, Cognitive, Affective); (2) Planning (Scope and Sequence of the Curriculum, Curricular Materials in Subject Area, Learning Process and Child Development, Innovative Programs and Practices); and (3) Evaluation-Diagnosis. On each item teachers may be observed to operate at one of four levels: (1) knowledge of (the environment for); (2) ability to establish (the environment for); (3) ability to analyze (the existing environment for); (4) ability to evaluate (the existing environment for). Teacher questionnaires and interviews supplement classroom observation records in the description-writing process. The instrument is being further refined and a program to prepare clinicians developed. (The category items, a sample observation sheet, and steps in administration are included.) (JS)