This teacher's guide to unit four of the second-semester "Comparing Political Experiences" course provides specific objectives and instructional procedures for each of five activities which focus on the smog problem in Riverside, California. In addition, the guide provides instructions for coordinating the use of the student text, audiovisual material, data packet, and skills kit for the unit. The introduction contains a statement of the general rationale; knowledge objectives; analytical, moral reasoning, and participation skill objectives; instructional design; and evaluation materials for the course and the unit. Knowledge of the Riverside documentary provides a concrete example of a system experiencing change. Ideally, students will move from the Riverside case as an illustration to knowledge of the concept of political change, and beyond to extending this knowledge of change to their own activities. Included are reaction forms to be filled out by the teacher to evaluate the effectiveness of the unit. (Author/DE)