With the purpose of obtaining relevant data about the curriculum, classroom, teacher, and peer effects on individual Head Start children, this project plans to have trained observers spend several hours in the classroom (1) attending to and recording the total functions of the class and (2) attending to and recording the behavior of individual children. A comprehensive, somewhat complex, system of rating teacher-child behavior and classroom activities has been devised to record the data. Exploratory observation and training of observers will precede the primary data gathering project. There are plans to film the classrooms being observed in order to reconsider as a whole what the observers, by their rating scales, pulverize into many pieces of data. The analysis of the data will be directed towards developing specific predictions for individual children, classes, and clusters of classes regarding effects of various kinds of programs on children. (WD)