Adventure therapy theory draws from a mixture of learning and psychological theories. The learning theories include contributions from Albert Bandura, John Dewey, Kurt Hahn, and Kurt Lewin. These theorists also have been credited with contributing to the main theories comprising experiential education. Experiential education is a theoretical component of adventure therapy. The ideas and thinking of Alfred Adler, Albert Ellis, Milton Erickson, William Glasser, Carl Jung, Abraham Maslow, Jean Piaget, Carl Rogers, B.F. Skinner, Fritz Perls, and Viktor Frankl all appear to have contributed to the thinking in adventure therapy. Adventure therapy is a cognitive-behavioral-affective approach which utilizes a humanistic existential base to strategically enact change via direct experience through challenge.