From: Stan Hilliard
Date: 12 Sep 2001
Time: 01:51:38
Greetings Bart,
> YOU SAID -- "There is a great difference between the 2 sub-norms (ISO 2859-1 and 2859-2 B). In ISO 2859-1 there are for all AQL-values 15 different and fixed code letters (A-->H) whereas in 2859-2B for most LQ-values only 4 ranges are provided. Despite your answer this is still very difficult to understand! For example: N=300 items;n=50 items for ISO 2859-1; for ISO 2859-2 and LQ=2%: 200 items N=9900 items;n=200 items " ": " " " : 200 items "
REMARK -- Since there is no statistical link between the oc curves and the lot size, the lot size in the standard only reflects the philosophy of the ISO workgroup that designed ISO 2859-1 and 2859-2 B.
How do you know that their philosophy is rational in your situation? That is why my preference is to disregard the lot size (as long as N/n>10) and base the plan on the producers point and the consumers point of the oc curve.
Stan Hilliard