This document presents the four case studies that constituted the major sources for "Teacher Evaluation: A Study of Effective Practices" by the same authors. The study was undertaken to find teacher evaluation processes that produce information useful to school districts in helping teachers improve or in making personnel decisions. The four school districts selected for case studies represent diverse teacher evaluation processes and organizational environments: Salt Lake City, Utah; Lake Washington, Washington; Greenwich, Connecticut; and Toledo, Ohio. Indepth findings from each case study are discussed, including reasons for selection of that particular district and such topics as policy context, organizational setting, and the teacher evaluation system on paper and in practice. In the first study (Salt Lake City), pertinent information is also provided about the cultural context (the Mormons) and its relationship to the system of shared governance in the district. Despite differences in form, the four districts follow certain common practices in teacher evaluation: (1) providing top-level leadership and institutional resources for the evaluation process; (2) ensuring that evaluators have the necessary expertise; (3) faciltating collaboration between administrators and teachers; and (4) making evaluation and support systems compatible with each other and with the district's overall goals. (TE)