The basic model of concepts and measures developed for the Principal-Teacher Interaction Study is described. School organizational climate and contextual variables were defined to be consistent with the work of researchers in industrial and military settings. Many of the variables were generic to any type of organization. The model and variables were: PC = f(S, P, PxS, RI). PC represents psychological climate and describes the individuals' perception of his or her organization; S represents the situation; P is for personal characteristics; RI signifies the reciprocal interaction that occurs when the individual's perception of the climate influences S, P, or PxS. A distinction is made between the individual's perception of organizational attributes (PC) and the composite climate, which can be represented by summing the individual PC's. The measure developed to assess the variables was entitled the School Ecology Survey. Items for the survey were drawn from the Organizational Climate Questionnaire, DDAE/CRITERIA, Building Questionnaire, Trouble Shooting Checklist, and School Climate Questionnaire. The authors used the School Ecology Survey to assess the psychological climate in the district and school surveys they conducted. (DWH)