Can I change AQL level from 0.40% to 0.65%?

THEERANART

Starting to get Involved
#1
I would like to know if I change AQL level from 0.4% to 0.65% because operation section need to deliver product to customer .
I have done Acceptance Sampling for Product Damper if we need change AQL level from 0.40% to 0.65% as the same others products.
Right now Damper defective rate running around 1.24%( RQL or LTPD) at OQA, 0.05 Alpha and 0.1 Beta .

Based Two Proportions compare between 0.40% AQL and 0.65% AQL level are not significant different .
That mean 0.65% AQL can catch up defect . I would like to knoe it can help more to detect defects or not.
 

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reynald

Quite Involved in Discussions
#2
Sure you can, but of course you may not. AQL levels are most often clearly communicated to your customers and sometimes even specified in writing through customer contracts.
So before you change make sure you communicate and get approval from all direct and indirect stakeholders. Make sure you tell them the resulting AOQL (Average Outgoing Quality Level).

By the way you intepret OC curves using 3 observations:
1. The length of the Plateau -- This is the horizontal line in the upper part of the curve. The shorter the better. It reflects the maximum defect that you will accept. For this case you are changing from about 0.4 to about 0.7
2. The slope of the cliff -- The steeper the better. It reflects your decisiveness about when to accept or reject a lot.
3. The length of the Valley --This is the horizontal line in the lower part of the curve. The longer the better. Look at the Lot percent defective on the point where the slope first touches the "ground". That is the %defective that you have a low but probable chance of accepting. For this case you are changing from about 1.75 to about 1.5
 
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