Researchers have concluded that the continued debate over the heredity-environment issue concerning the nature of intelligence is nonproductive. Recent evidence demonstrates that intellectual abilities can be improved with practice. Heredity may determine upper limits of abilities within individuals, but there is considerable room left for improvement with practice. The Guilford model of intelligence suggests that intelligence is a systematic collection of functions for processing information. The most important intellectual skill that an individual can master is the discovery of the processes surrounding successful problem solving. A research design was implemented to apply the concept of intelligence as a series of teachable skills in a classroom setting. The subjects were 89 ninth grade students selected on the basis of low achievement scores. Pretest posttest results indicate that the adolescents' intellectual skills are capable of improvement in a relatively short period of time. (JN)