求翻译：Demand forecasting is the process of estimating the future numbers of people required and the likely skills and competences they will need. The ideal basis of the forecast is an annual budget and longer-term business plan, translated into activity levels for each function and department or decisions on ‘downsizing’, in a manufacturing company the sales budget is translated into a manufacturing plan giving the numbers and types of products to be made in each period. From this information the number of hours to be worked by each skill category to make the quota for each period can be computed.是什么意思？

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