This activity, the fourth in the elementary set of teacher-developed instructional activities for teaching geography, focuses on knowledge and cognitive processes of economic and social diversity within an urban setting. Content includes the economic and social structure and problems of American cities as exemplified by Gary, Indiana. The processes stressed are classifying, interpreting, evaluating, and decision making. Maps constructed from census data serve as the source for raising questions and developing hypotheses concerning correlations, causes, and consequences of the city's structure and problems. Role playing and sociometric mapping techniques are employed as a means for considering criteria used to evaluate people. See SO 009 140 for a general description and explanation of the elementary and secondary sets that comprise this series. (Author/ND)