Archive for February, 2010
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25
Feb
2010
Supply Chain article – Golden Rules
Companies need to start using common sense to survive, says business thinker Dr Eli Goldratt. Rebecca Ellinor distils his words of wisdom.
Are we really in troubled times? No, we’re just panicking, says Dr Eliyahu Goldratt. The worldrenowned business management consultant and author of The Goal, which was recently included in The 100 Best Business Books of All Time, has always challenged people to think differently. In The Goal, written 25 years ago when he was a physicist, Dr Goldratt outlined his ‘theory of constraints’, with the premise that the rate of goal achievement is limited by at least one constraining process. He argued that only by increasing fl ow through the constraint can overall throughput be improved.
Originally directed at the manufacturing industry, its central messages hold true today. He now helps organisations to apply his advice, considered so broadly applicable that when he visited the UK this spring the 130-strong audience at his seminar included child psychologists, buyers and senior managers from the public and private sectors…Click here to continue reading
23
Feb
2010
Theory of Constraints Golden Nugget
#5 – Assessing super rapid time at an early stage
(RRR)
To fully enroll the Rapid Response (RR) offer, without taking a risk of deteriorating Reliability, it is required to shrink the production buffer to less than one quarter of the industry lead time. Reaching that stage takes substantial time. Much before that stage – when load control is implemented – the lead time is shorter than half the industry lead time. Since the financial benefits of getting even a fraction of the orders in RR prices are so significant, the S&T tree recommends to start offering RR on a limited volume (less than ten percent of the capacity) immediately after load-control is put in place. We know that the company can safely offer lead times which are half the industry lead time as rapid service, but what can the company offer, at that early stage, as super-rapid service?…Click here to continue reading
8
Feb
2010
Theory of Constraints Golden Nugget
#4 – Inventory target, Asymmetric time constants
(MTA; Production)
When experiencing a decline or increase of consumption for an SKU, the inventory target should be changed accordingly. But many times a change in consumption is merely a statistical fluctuation and not a trend, and therefore should not trigger an inventory target change. Trouble is, when experiencing a lower or higher consumption, we cannot foretell if it signifies a long term change that requires action (changing inventory target), or whether it is just a fluctuation.
We want to react quickly to real changes, but not to noise: If we react too fast, many noises will be treated as real changes, and we will cause undesirable oscillations in the system – frequent changes of the inventory target, back and forth. On the other hand, if the reaction will be delayed, the system will meanwhile suffer from either too high or too low inventory levels. Obviously, we need to decide on a suitable time constant for responding to change – determining for how long should the buffer stay red\green before we react by changing the inventory target.
Up to this point we… Click here to continue reading.
| Watch Dr. Goldratt’s presentation on the TOC solution to adjust inventory levels according to systematic changes in the inventory consumption rate. The robust mechanism called Buffer Management ensures relatively low levels of inventory while having high availability. Specifics of the concept are described and explained in Goldratt’s TOC Golden Nugget #4. | ||||
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