This report briefly reviews research on teacher effectiveness and presents the conclusions of a 2-day conference held in October 1969 to consider issues related to the assessment of teacher effectiveness and make recommendations to the U.S. Office of Education (USOE) regarding the encouragement of research in this area. The committee concluded that USOE should encourage and support a large-scale systematic approach to research on teacher effectiveness, including the development and testing of measurement instruments which allow for cultural diversity and varying criteria. These instruments would be used in descriptive research to identify teacher and student characteristics and behaviors and longitudinal experimental research which would assess effects, changes, and relationships that may be inferred to result from identifiable teacher education experiences. (The report includes an 89-item bibliography.) (RT)