The kinds of information that have been used in the past to evaluate the effectiveness of college teaching are briefly reviewed, and the advantages and disadvantages of eight sources that seem most useful for making such judgments are discussed. Possible sources of information for evaluating an instructor's teaching effectiveness are: classroom visitation; a course portfolio; long-term followup of students; measurement of student achievement; opinions of deans, department heads, and colleagues; self-evaluation; systematic student ratings; and academic advisement. Little importance should be attached to the following sources of information: enrollment in elective courses, grade distributions, informal student opinions, and scholarly research and publication. Since there is no single source of information that is acceptable for evaluating college teaching, it is strongly recommended that several sources be used to evaluate college teaching. These sources should be chosen so that in combination they provide accurate and valid information about all of the individual instructor's teaching responsibilities. Teaching responsibilities of most faculty members would seem to be adequately covered by using systematic student ratings, course portfolios, opinions of colleagues and department heads, and self-evaluation. (SW)