A need for a particular product or component. The demand could come from any number of sources (e.g, a customer order or forecast, an interplant require?ment, a branch warehouse request for a service part, or the manufacturing of another product). At the finished goods level, demand data is usually different from sales data because demand does not necessarily result in sales (i.e, if there is no stock, there will be no sale). There are generally up to four components of demand: cyclical component, random component, seasonal component, and trend component. See: booked orders.
需求—对某种产品或部件的需求。需求可以有多个来源，如客户订单或预测、厂际需求、分库对备用件或用于生产另外产品的要求。在最终产品层，需求数据通常和销售数据不同，因为需求不一定导致销售（也就是说，如果没有库存就无法销售）。需求通常包含四部分：周期部分、随机部分、季节性部分和趋势部分。
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