needs assessment
The determination of needs is one of the most important tasks of material management and production planning and control, and deals with the calculation of the secondary requirements required for the fulfillment of primary requirements. In principle, it is important to calculate which parts, assemblies, materials, materials, etc., in which quantity, at which place and at what time for the production of the products are needed. For production or economic reasons, the required parts, subassemblies etc. have to be manufactured or transported in larger batches. When calculating the lot size, it is necessary to consider not only the purchasing prices and manufacturing costs, but all relevant costs, such as transport, storage, set-up, interrupt, information, communication, interest costs, etc.