The result: Electrical Supply Distributors have to provide better material availability and more services with fewer profit dollars. They have to do more with less. In order to accomplish this goal the estimates of future usage of stocked items must be as accurate as possible. In this document we will explore some ideas we have found to be effective in developing accurate demand forecasts for your stock products.
Traditional Forecasting Methods
One of the most common methods distributors utilize to forecast future demand of products is to average the usage recorded over the previous several months.
But averaging past usage does not always result in an accurate forecast of future demand. If the distributor experienced unusually large sales of a product, averaging the usage in the past six months would result in an inaccurate forecast. For example, suppose the distributor experienced an unusual 1,000 piece sale of the product we examined before (i.e. usage in June is 1,080 pieces instead of 80 pieces):
To ensure the accuracy of demand forecasts, it is critical that buyers or salespeople examine possible unusual usage. A report or inquiry should list products whose usage in the month just completed is greater than "x" percent, or less than "y" percent, of the forecast. For example, some distributors will scrutinize any item whose usage is greater
than 300% or less than 20% of the predicted demand. These percentages are not "cast in stone" and should be modified to meet each distributor’s specific situation. There are three reasons why an item would be included on this possible unusual activity list:
If the possible unusual usage was caused by activity that will not reoccur, usage should be adjusted to equal what usage would have been under "normal" circumstances. If a new sales trend is detected, you might want to either adjust past usage to reflect current market conditions or override the actual forecast until adequate history that reflects the new trend has been accumulated.
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