A comprehensive observation study of classroom processes and instructional practices in Follow Through Planned Variation projects (FT) was completed in August of 1974. FT was evaluated primarily to determine whether educational innovators were able to implement their model programs of compensatory education in several diverse sites. Thirty six projects included in the sample represented seven sponsors of educational models, all geographic regions, urban and rural areas, several racial and ethnic groups, and a total of 136 grade 1 and 137 grade 3 classrooms. The Classroom Observation Instrument was employed to gather data of the following three types: (1) physical environment, materials, and seating arrangements; (2) grouping of children and teaching staff and recording of all classroom activities; and (3) interactions between adults and children. Each classroom was observed three days for five hours each day. The degree of implementation was defined as the extent to which a sponsor had been able to influence teachers in different sites to follow model specifications in their classrooms. Two criteria were used to judge implementation: (1) the similarity between the classrooms when compared on sponsor selected variables and (2) the difference between sponsor classrooms from non-FT classrooms. (RL)