The document provides an overview of several prominent career development theories. It begins by defining career development and career counseling. It then outlines Donald Super's career development theory, including his concepts of self-concept, life stages, and life spaces. John Holland's theory of vocational personalities and work environments is explained. The document also summarizes Abraham Maslow's hierarchy of needs, John Krumboltz's learning theory, Nancy Schlossberg's transition theory, and L. Sunny Hansen's integrated life planning theory. It concludes by describing the cognitive information processing approach to career counseling. In under 3 sentences, the document surveys major career development theories and how they inform the work of career practitioners.