Implementing an enrollment projection methodology and a planning methodology in a school district is often a complex problem because many possibilities exist. The purpose of this study is to demonstrate that successful research techniques used by some school districts can instruct other districts about methods and aims to pursue or avoid in enrollment projection efforts. The four case studies explained in this document describe enrollment projection methodologies presently used in four metropolitan areas that are experiencing declining enrollments and drastic population shifts. The book also describes methodologies for projecting individual school enrollment and two enrollment projection methodologies that incorporate variables other than past enrollment trends. The latter procedures--land use adjustment and the balancing factor--are examples from the Eugene (Oregon) school district. (Author/LD)