Auditing a finished lot for defects

Does anyone have an SOP or procedure for auditing a finished lot for defects?

More information is required.

A finished lot of what?

Are there specifications? Customer requirements?

Marshall

I was looking for a guideline for an SOP on random sampling of a finished lot of product (any food)- looking for a quality defect. 

If you suspect a quality defect - or just want to verify that the specification was met during production. 

Is there a specific sampling plan that is recommended?  I have always heard "square root + 1" but this seems a bit excessive (example: we have 3686 units in a batch - that would be 62 units to inspect).

We are under the cannery regulations and from time to time the inspector wants to verify a specific quality attribute.  I need to put together an SOP so that we inspect consistently - and it does not get out of hand.  I was hoping to have this inspection done by my team in a controlled fashion - and have the inspector accept the records of the inspection in lieu.

I was looking for sampling standards - if there are any that exist in this situation.

Thanks for your help :biggrin:

Hi Mazie,

Square rooots and the like are semi-scientifically based.

Tthe options typically relate to yr acceptable limits, yr desired accuracy, the variation of the attribute within the lot, whether destructive or non-destructive sampling is involved, cost of analysis, etc, etc.

As mgourley stated, it all depends on the details.

In principle,there are (at least) 2 basic approaches to yr attribute query. As a starter, could have a look at this post and the surrounding thread  -

http://www.ifsqn.com...aql/#entry82001

Hi Mazie,

just as addendum to previous, these 3 threads are primarily non-AQL oriented -

http://www.ifsqn.com...ecs/#entry72991

http://www.ifsqn.com...uct/#entry26434

http://www.ifsqn.com...ans/#entry64942

HI,

I have used mil inspections in the past for this type of inspection.  Interactive sampling plans can be found at www.sqconline.com.  Hope this helps.

Regards,

Lynne

HI,

 

I have used mil inspections in the past for this type of inspection.  Interactive sampling plans can be found at www.sqconline.com.  Hope this helps.

 

Regards,

Lynne

Appears to require an account / money

Just google "mil std 105d"

This standard is no longer supported by the US Army, but the tables are still valid and replicated in ANSI/ASQ Z1.4: Sampling procedures and Tables for Attribute Sampling..  Unfortunately $159, though

 As a free example you will find in google ...

http://everyspec.com...STD-105D_11676/  with a download button

Regards,

The Director