This programed instruction project for adult Four-H leaders was undertaken to develop a ten unit manuscript covering basic Four H concepts; to prepare four versions thereof differing in response mode; to field test all four on a national sample of leaders; and to prepare a final research edition of the course based on the response mode proving most effective. Two groups of about 600 each were given multiple choice pretests based on programed materials. Alternatives were multiple choice programed texts, multiple choice marked format, essay format, and essay answered format. Performance and background data were obtained on all subjects. The multiple choice marked (MCM) format was chosen, and unprogramed portions of the material were programed accordingly. It was recommended that the MCM format be used for subsequent editions of the self-study course, and that pictures and an attractive format be added. (The document includes pretests and posttests, guidelines for writing materials to be programed, descriptions of field test items, data codes, the experimental design, and 42 references.) (LY)