The proposed Controlled Choice Student Assignment Plan for the Boston Public Schools guarantees equitable school desegregation by allowing parents and students to make multiple school selections by their own rank-order of preference that will be used to allocate school space in a racially proportional manner. The plan enhances the quality of education by obligating every school to offer an attractive learning environment in a competitive atmosphere. The city will be divided into three assignment zones, each operating as if it were an autonomous school system with its own superintendent and an advisory council of parents, educators, and community leaders. Each school principal will be accountable for improving educational quality while maintaining racial diversity. Each school's enrollment must reflect the racial ratio of the entire school system. Other features include the following: (1) maximum student travel time is between 30 and 40 minutes; (2) zones link contiguous residential areas that meet the criteria of equity and diversity; (3) zones encompass an equivalent range of educational programs and services and have sufficient instructional space to accommodate all residential students; and (4) all racial, ethnic, and socioeconomic groups must have fair access to all schools within a zone. Seven newspaper articles are included. A description of the student assignment process and 15 tables of statistical data (zone student profiles) are appended. (FMW)