Lollypop zei:
Ik had hem een mail gestuurd over wat hij vond van JIT en dit was zijn antwoord:
It is but you may want to limit TPS to something a bit more specific.
Think about limitations in time, region, etc.
Wat bedoelt hij met het laatste ?
Dit is gerelateerd aan het elimineren van de zeven types waste in het Toyota Production System.
Identifying waste is the first step towards eliminating it. Toyota have identified seven types of waste, which have been found to apply in many different types of operations – both service and production – and which form the core of lean philosophy:
1 Over-production. Producing more than is immediately needed by the next process in the operation is the greatest source of waste according to Toyota.
2 Waiting time. Equipment efficiency and labour efficiency are two popular measures which are widely used to measure equipment and labour waiting time, respectively. Less obvious is the amount of waiting time of items, disguised by operators who are kept busy producing WIP which is not needed at the time.
3 Transport. Moving items around the operation, together with the double and triple handling of WIP, does not add value. Layout changes which bring processes closer together, improvements in transport methods and workplace organization can all reduce waste.
4 Process. The process itself may be a source of waste. Some operations may only exist because of poor component design, or poor maintenance, and so could be eliminated.
5 Inventory. All inventory should become a target for elimination. However, it is only by tackling the causes of inventory that it can be reduced.
6 Motion. An operator may look busy but sometimes no value is being added by the work. Simplification of work is a rich source of reduction in the waste of motion.
7 Defectives. Quality waste is often very significant in operations. Total costs of quality are much greater than has traditionally been considered, and it is therefore more important to attack the causes of such costs. This is discussed further in Chapter 17.
Between them, these seven types of waste contribute to four barriers to any operation achieving lean synchronization. They are: waste from irregular (non-streamlined) flow, waste from inexact supply, waste from inflexible response, and waste from variability.