By E. Kay, R Brown, G. Chandler and W. A. Davis (Auth.)
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Order picking becomes necessary when the unit of input is different, and greater, than the unit of output. There are essentially only two methods: Commodity directed, which we shall call "parallel picking" and order directed, or "sequential picking". 2. Parallel picking means that a number of orders are dealt with in parallel, by selecting the total quantity of one commodity at a time required for that number of orders and distributing it to the orders. 3. Sequential order picking deals with the orders in sequence that is selecting all the commodities required for a single order, at a time.
54 HANDLING IN A WAREHOUSE What matters is that each variety has a different stock variance. Stock variance is often in inverse proportion to movement rate, usually due to longer replenishment cycles for the items in low demand. This will result in relatively larger capacity requirements for slow movers. Variety, therefore, forces a choice between the following alternatives: (i) exclude the slow moving commodities from automation; (ii) attempt to decrease stock variances of these items by altering their replenishment system; or (iii) a mixture of (i) and (ii) above.
This calculation does not, of course, exclude the result that each commodity ought to be stored separately. An illustration of the above process is given in the numerical example on page 71. 6. The savings in handling effort and space due to storing different commodities together must, of course, be set off against increased cost of data processing, that such a storage pattern requires. It is obvious that, if a computer is used for stock control or order processing, then the cost of the additional data processing will be relatively low, as all that will be required is a modification to the existing programmes.