This report evaluates the influence of five language programs on the learning of children in year-round Head Start programs. It presents the statistical analysis and design of an investigation conducted in ten classrooms in two sites (Henderson, North Carolina and Vero Beach, Florida). The core of the programs was the Buchanan Readiness in Language Arts program with four combinations of supplements. A monitored and an unmonitored control group were used in each site. It was hypothesized that the experimental classes would outrank the controls in a predetermined order. Although significant differences were found on several subtest measures, the data did not support the hypothesis. The experimental groups, in general, outperformed the control groups on only two of the pre- posttest measures (alphabet and letter recognition). Appendixes comprise one-half of the document and include two manuals for teachers (Buchanan-Swanson Supplement and the Reinstein Reinforcement Program), cover letters and sample questionnaires used in the language program evaluation, a listing of instruments common to national evaluation projects, forms and reports used for a variety of tests and testing conditions, a listing of personnel, and the tables from statistical analyses. The interim report emphasizing the general rationale for this investigation is available as PS 003 680. [Filmed from best available copy.] (WY)