This case is a continuation of Case 4.3, which involved the Springfield School Board assigning students from six residential areas to the city’s three remaining middle schools. After solving a linear programming model for the problem with any software package, that package’s sensitivity analysis report now needs to be used for two purposes. One is to check on the effect of an increase in certain bussing costs because of ongoing road construction in one of the residential areas. The other is to explore the advisability of adding portable classrooms to increase the capacity of one or more of the middle schools for a few years.