The P.E.P. Report 1969-1973 focuses on the various findings and activities of the Program Evaluation Project. The study in this chapter was designed to conduct a statistical analysis of the Goal Attainment Score, and estimate variance components due to choice of material in the followup guide, followup interviewer bias or error, and the client's actual long-term deviation from expectation. These factors together determine the reliability of the Goal Attainment score as it was applied in this Program Evaluation Project study, and, in addition, provide some useful indication of its potential reliability in other evaluative applications. (Author/RC)