Nothing is worse than an operation that is understaffed because a low level of sales was erroneously forecasted. The next worst scenario is that management has forecasted a high level of sales, but because something unexpected happaned, the sales figure did not materialize and a full crew is left with nothing to do. Therefore, an accurate sales forecast is necessary. Per period and daily recap of sales and customer counts, check averages, historical data, special event, and seasonal and weather changes can all lend a hand in determining sales levels.