In order to approach an acceptable solution to the problem of defining attendance areas in a school district, decisionmakers need a systematic method of subdividing the district into manipulable components, reliable information regarding the location of children in the district, and a clear understanding of the constraints under which a decision is to be made and the objectives that are being sought. An interactive computer program is a desirable means of speeding progress toward a feasible solution by permitting many alternatives to be examined easily. This article discusses the development of a data base, an interactive program, and a school district model based on U. S. Census blocks. It also comments on the application of the procedure to the analysis of the problem of adjusting attendance area boundaries in a particular school district. A sample computer output is included. (Author)