In order to collect the necessary information on various practices and devices used in school climate assessment, 22 of the 39 school improvement projects mentioned in the Miles and Kaufman directory of effective schools programs were selected for a survey. A questionnaire was used to collect the primary data. Each program was asked for copies of the climate assessment devices used in the project. The 22 projects used a total of 82 instruments. Each project used 1-12 instruments with a mean number of 3.8 per project. Every project surveyed teachers, 14 surveyed administrators, 9 surveyed other school staff, 12 surveyed parents, and 12 projects asked students about their perceptions of the school. This report summarizes the content of the item groupings in the projects' assessments, general characteristics of the instruments, utility of the information yielded, and the psychometric properties of the instruments used by the programs. Twenty instruments in 11 projects met the criterion of face validity, and their characteristics, including costs, are described in more detail. It is concluded that while reliable, valid, practical measures of dimensions of school organization and composition exist, they exist amidst an ocean of measures whose characteristics are unknown. Appendix A provides summaries of all the school climate assessment instruments with the following information: instrument title and project number, author(s), institution, availability, intended purpose, reliability information, validity information, scoring, content, strengths and weaknesses, and general comments. The study's data collection form and the coding scheme used to code scale content are also appended. (JAZ)