The Classroom Interaction Analysis Index (CIAI) was developed to categorize the actions of teachers and students as they interact in classroom situations. The CIAI rating system is easy to learn and easy to use. Experience has shown that the average teacher or supervisor can use it effectively after three or four one-hour sessions. The purpose of the instrument is to provide a profile of classroom behaviors and verbalizations during the entire lesson. These profiles can then be compared and analyzed. Presently, the CIAI is being used in teacher training, inservice training of supervisors, and further research. Included are the instrument itself, explanations of the categories and items of the instrument, and a bibliography. (Author/MLF)