This executive summary presents the major findings of Interim Report III, which reports preliminary evaluation of Project Developmental Continuity (PDC). A Head Start demonstration program, PDC is aimed at promoting greater educational and developmental continuity as children make the transition from preschool to school. The report addresses three fundamental questions: the appropriateness of the measuring instruments; the potential comparability of children in PDC schools and those in comparison schools; and the number of children in PDC and comparison schools at each site available for a longitudinal study of program effects. Evaluation methods (instrument selection, data collection, and data analysis procedures) are discussed briefly and findings are summarized in terms of descriptive characteristics of the samples; reliability and validity of the instruments; comparability of PDC and comparison groups site-level and aggregate-level; and sample size requirements and availability. Conclusions and recommendations are presented. Numerous charts and tables illustrating the findings are included and descriptions of the selected measures of evaluation are appended. (CM)