The need to account for seasonality is apparent if you look at a graph of the trend line. There is a spike in demand in the 5th period of each 5-period cycle. Unfortunately, OM Explorer’s Seasonal Forecasting Solver does not cover the case where there are 5 periods in a cycle (or seasons in a year). You must do some manual calculations. Begin by calculating the seasonal factor for each period in each of the first 4 cycles, and then calculating the average seasonal factor for each period (see Example 8.6). Now estimate the total demand for cycle