Presented is a theoretical, hierarchical model of abstraction designed to provide a systematic theoretical framework for future research into abstract learning. A test of the model with 149 subjects supported the assumption that the hierarchical model of abstraction is valid. (SL)

College students (N=52) were given unfamiliar or novel problems (written and interview responses) to determine how they characterize living things, criteria they use to distinguish between living/dead/nonliving, and to determine if their idea of life included the interrelationship between organisms and biosphere. Results and implications are…