A study was done of the effects of cooperative learning and conflict resolution on the student perception of the social climate at three campuses of an alternative high school in New York City. The study looked at the effect on one campus that received 2 years of conflict resolution training, another campus that received 2 years of cooperative learning training, and another campus that received 1 year of conflict resolution training followed by 1 year of training in both conflict resolution and cooperative learning. The data for the study came from a main student survey that was administered initially in June of 1988 to 350 students across three campuses and readministered at several points to new students. In May of 1989, January of 1990, and May of 1990, 345 students who had previously answered the pre-survey completed a similar post-survey. Analysis of the results found some of the following: (1) positive changes over time in discipline and clarity and fairness of policy; (2) students experienced more promotive interdependence over time but less liking for school and learning; and (3) generally positive changes with some differences between campuses. Included are 18 tables, 1 graph, 2 appendixes (containing 11 tables of data from a principal components analysis of climate measures and derivation of scale scores), and 28 references. (JB)