This report describes the use of a model to compare the costs of two alternatives: initiation of a K-5, 45-15 year-round school, or the construction of an elementary school building in the Annville-Cleona, Pennsylvania, school district. The results of the analysis indicated that the initiation of a 45-15 year round plan would save the district about $89 per pupil of total operating costs in the last 18 years of the 20 year term of the district's bond issue. For the first two years, the savings would be $51 per pupil over the construction of a new building. Although the particular all year school plan analyzed in this situation was the 45-15 program, other specific plans with other pupil attendance arrangements could be analyzed by use of the model. (Author/JF)