This simulation employs a case history of an actual crisis intervention in a municipal agency to describe the general principles of change within a social system, to explain the role of the consultants in the change process, and to illustrate a rationale for change procedures. Specifically, the intervention strategy employed to solve internal problems of the health department of the city of Cincinnati is detailed. The case analysis is organized around the major decision points confronting the change agents in order to allow readers to compare their choice of an action strategy with that of the consultants. The text is divided into the following sections: "Entry,""Design of Entry,""Diagnosis/Data Collection,""Data Analysis/Action Steps," and "Review." (KS)