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all SKUs. Normally there is a range of items from high volume, low variability items that require a highly repetitive supply plan, through to those with sporadic requirements that should ideally be 'make to order'. This segmentation fits closely with the principles of Lean Manufacturing. A common mistake here is to confuse Demand Variability calculated entirely from the historical demand pattern with Forecast Variability, which is the variance between history and forecast. The former is correct the later is meaningless. 6. Use the correct replenishment rule to calculate the correct stock level for each SKU level, to satisfy the agreed customer service level in the SLA. Once all the levers of cost are understood and the appropriate replenishment rule selected for each SKU, an inventory and production plan can be built that delivers the desired customer service Levels. In order to get the correct balance of inventory and manufacturing cost, a new way of calculating inventory h...