The hypothesis or ideas for the present research grew from the personality theories of Carl Rogers (1954: 1959) and A. H. Maslow (1954) and from the study of the personalities of outstandingly creative individuals rather than from experimental data. The research was an attempt to test the integrative value of a simple, abstract construct, that of psychological development, in several situations and tests. The concept of psychological development is clearly analogous to the concept of physical development. Both involve the development of capacities previously present in the organism and the establishment of new capacities. Both involve a changing state rather than a static state. The central idea of the personality theories of both Rogers and Maslow is the idea of growth (self-actualization, development, becoming, or psychological health). Maslow suggests that self-actualizers (outstandingly creative individuals such as Beethoven and Goethe) have the ability to grow, are superior to others in their perception of the environment, have greater autonomy, greater freshness in their appreciation of experience, greater spontaneity, greater acceptance of self and others, and are able to live fully in each experience. In several recent papers Rogers ( 1954, 1959) has defined certain directional tendencies in the individual who has successfully undergone therapy. For Rogers these directional tendencies are clearly asymptotic or ideal. Implicit in Rogers' definition is the concept of the fully functioning person, . . . a concept of the ultimate in the actualization of the human organism. According to Rogers, the fully functioning person will be more open to experience (he will have better perception of the environment), will experience himself as the locus of evaluation (he will rely upon his own judgments rather than those of others), and will move toward being a process rather than being some fixed goal. Maslow's definition of self-actualization and Rogers' definition of the fully functioning person have much in common. Both definitions emphasize superior perception of the environment, greater reliance by the individual upon his own judgments rather than those of others, and both definitions suggest selfactualization or psychological growth as the central human drive. For the conceptual framework of the present research we need not make the assumption that the central human drive is toward self-actualization. We assume that some -- writer wishes to express gratitude to Drs. Carl Rogers, Jerome Schein, William James,
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