Designed for use by diploma or graduate students in counselor education, this student's manual consists of six units of instructional materials dealing with vocational development theory. Topics of the units are historical and theoretical considerations, trait- and factor-based theory, developmental vocational theory, social and learning-based theory, client-centered and other approaches, and other factors in vocational development. Included in each unit are the following: objectives, basic references, background references, capsule summary, important questions, relevant experiences (learning activities), and suggestions for additional reading. (MN)