1. INTRODUCTION

DEFINATION AND MEANING

Inventory is a list of goods and materials, or those goods and materials themselves, held available in stock by a business. Inventory are held in order to manage and hide from the customer the fact that manufacture/supply delay is longer than delivery delay, and also to ease the effect of imperfections in the manufacturing process that lower production efficiencies if production capacity stands idle for lack of materials.

The reasons for keeping stock

All these stock reasons can apply to any owner or product stage.

Buffer stock is held in individual workstations against the possibility that the upstream workstation may be a little delayed in providing the next item for processing. Whilst some processes carry very large buffer stocks, Toyota moved to one (or a few items) and has now moved to eliminate this stock type.

Safety stock is held against process or machine failure in the hope/belief that the failure can be repaired before the stock runs out. This type of stock can be eliminated by programmes like Total Productive Maintenance

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