库存的种类(按货品分)
自然物料(Raw materials: Resources required in the production or processing activity of the firm)
零部件(Components: Includes parts and subassemblies)
半成品库存及在制品库存 (Work-in-process (WIP)): 指在生产作业过程中,等候加工或已加工过的物料和产品
WIP被作为衡量生产计划系统效率的指标
从生产运作管理来看,JIT 目标就是要把WIP减少到零
制成品/最终产品Finished good: also known as end items or the final products.