This paper examines in detail the problem of evaluation as applied to adult education, and presents results of a study in which adult students evaluated the night school program in Vancouver by means of a questionnaire. The following topics are discussed: the definition of evaluation; the differences between evaluation as applied to adult education and to formal education; the meaningfulness of evaluation; its basic theory; and which questions to ask about the success of adult education and how to secure answers. The Vancouver study revealed that an overwhelming majority of the participants look very favorably on their adult school experiences and consider they are achieving their objectives. A copy of the questionnaire is included. (CL)