Traditional personality theory and assessment tend to focus on various' aspects of the self and its relationships to the human environment. Moreover, they tend to regard human behavior as a function of the social environment. Both of these-underlying assumptions are problematic for environmental psychology. First, our environment does not only consist of people but also of nature and, more than ever, of man-shaped nature and man'made objects. Second, man's behavior is not only determined by his human and his non-human environment, but he creates parts of his environment as well. It is necessary, therefore, to investigate more thoroughly man's psychological relations to his everyday non-human physical environment.