A linear program model designed to aid in site selection and the development of pupil assignment plans is illustrated in terms of a hypothetical school system. The model is designed to provide the best possible realization of any single stated objective (for example, "Minimize the distance that pupils must travel") given any number of specified constraints (for example, "No school may have an enrollment greater than its design capacity," or "Racial percentages must be within predetermined bounds"). The model uses two programs written in Fortran, both documented in full in an extensive appendix. (Author/PGD)