This study investigates the influences and relationships between self-concept elements and students' activities in a normal school environment and focuses on individual self-construct. Interest has an important effect on an individual's learning process and behavior. There are three common definitions of interest: (1) interest as a characteristic of the person (individual interest); (2) interest as a characteristic of the learning environment (interestingness); and (3) interest as a psychological state. The investigation is based on a play-oriented teaching approach in an 8th grade gymnasium course. (Contains 21 references.) (YDS)