Sampling plan vs. test samples - All samples taken have to be tested to all specs?

I

i_muchlis

#1
Hi all,
I would appreciate any comment from the forum. For a certain sampling plan (for acceptance) with certain AQL, is it common in practice that not all samples taken have to be tested to all specifications? In this case the specification is divided in three different catagory critical, major, and minor.

Thank you in advance,
I Muchlis
 
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Jen Kirley

Quality and Auditing Expert
Staff member
Admin
#2
Welcome to The Cove, I Muchlis! :bigwave:

Normally I would not set up a different sampling run for different categories of defect severity. Instead, as this link shows, the AQL might vary (depending on the item) according to the number of this or that category: major, minor etc. http://www.hqts.com/faq.php
 
I

i_muchlis

#3
Dear Jennifer,
Thank you for replying my inquiry. I am still wondering in what condition we could use the special inspection levels (S1 to S4), is there a certain requirement for choosing one of these inspection level? And could I apply general and special inspection level together, what is the requirement for doing so, and what about the AQL for these two inspection levels (general and special), is it have to be the same?

Thank you in advance,
I. Muchlis
 

Jen Kirley

Quality and Auditing Expert
Staff member
Admin
#4
You are certainly welcome, I. Muchlis. I am sorry I have not responded sooner.

Here is another link that describes the sampling plan, which can be very confusing. Links to Mil-Std-105E are included. http://www.asiainspection.com/QI/AIWeb.nsf/Glossary2?ReadForm

Smaller samples are sometimes deemed appropriate when the statistical risk of the sample not representing the actual condition is outweighed by factors like the cost of inspecting larger samples. The small samples are called S1 through S4. Here is a site that describes S1 through S4 sampling: http://www.aqlinspectorsrule.com/manual/levels.htm

Here are some more information sources: http://www.variation.com/library.html

I hope this helps!
 
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