This report is a description and analysis of the Hyde Park cadre as a "social system:" a description of the Hyde Park High School, the early life of the cadre, its operations and the disbanding of the cadre in June 1970. For the most part, it deals with the cadre and its activities for the 7 1/2 month period of its existence. Data were collected from secondary sources, interviews, nonparticipant observation at meetings, reading of correspondence, and observation of daily cadre activities. The Hyde Park cadre constituted a failure of the model; however, it offered many learning experiences for self-correlation of the program. These learnings are suggested in the implications. Appendixes of related program materials include a raw chronology of the cadre, its activities, and the major events in the external system which had implications for it. (Related document is SP005 964.) (MJM)