The schedule shows that four workers are assigned at 10 A.M., two are added at 11 A.M., and another two are added at noon to meet the requirement. From noon to 5 P.M. we have eight workers on duty. Note the overstaffing between 2 P.M. and 6 P.M. The four workers assigned at 10 A.M. finish their eight-hour shifts by 6 P.M., and four more workers are added to start their shifts. The two workers starting at 11 A.M. leave by 7 P.M., and the number of workers available drops to six. Therefore, four new workers are assigned at 7 P.M. At 9 P.M., there are 10 workers on duty, which is more than the requirement, so no worker is added. This procedure continues as new requirements are given.