The Stanford Research International (SRI) classroom observation system provides a description of the classroom environment with emphasis on interactions between teachers and students and among students. Included in the SRI observation system is the Five Minute Observation (FMO), which records classroom interactions into "frames" completed four times per hour describing "who" performed the observed action, "to whom" it was directed, and "what was done." While this system provides an excellent picture of the classroom, the amount of information provided is overwhelming. A method was developed for reducing the amount of data to be analyzed. FMO data from observations of nine second-grade classrooms was categorized by combinations of "who" and "to whom" codes found to occur most frequently. These categories were further divided into teacher-initiated and student-initiated interactions. It was felt that this system of categorization captured the major classroom interactions and excluded information of little educational value. A teacher profile created on the basis of categorical FMO can provide a basis for discerning the effects of various teaching styles on student behavior. (JD)