A compelling case statement--the stated rationale for the existence of an institution as well as for its growth and strengthening--is one of the most important tools for the success of a major development program. This document defines the components and uses of a case statement, discusses its elements in detail, and provides guidelines for case statement preparation. The discussion is illustrated by four appendixes. The first provides a brief case statement outline, including (1) a summary of the school's purpose, (2) a plan to accomplish the goals, and (3) a plan for involving people and raising dollars and volunteers. The second appendix provides a detailed case statement outline, including (1) institutional mission, (2) record of accomplishment, (3) directions for the future, (4) priorities and costs, (5) plan of action, and (6) sponsorship. The third appendix provides a checklist of institutional data, while the fourth is a sample case statement from the John Burroughs School (St. Louis, Missouri) for expansion of its sports and performing arts center. (TE)