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  Statistical Techniques and 6 Sigma
  Skip Lot Sampling

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Author Topic:   Skip Lot Sampling
Montserrat P
Lurker (<10 Posts)

Posts: 7
From:San Nicolás de los Garza, NL. Mexico
Registered: Aug 2000

posted 15 August 2000 02:42 PM     Click Here to See the Profile for Montserrat P   Click Here to Email Montserrat P     Edit/Delete Message   Reply w/Quote
Hello:
I would like to know if somebody have experience related with the use of the Skip Lot Sampling Technical. Our company want to implant this technical in our process.

I will appreciate a lot all kind of information related with it.

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CarolX
Forum Contributor

Posts: 108
From:Illinois, USA
Registered: Jun 2000

posted 15 August 2000 03:06 PM     Click Here to See the Profile for CarolX   Click Here to Email CarolX     Edit/Delete Message   Reply w/Quote
I have used skip lot sampling in the past, but it was so long ago, my tiny little mind does not recall how we did it.

Might I suggest using MIL-STD-105, and work into a reduced sampling plan?

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robertocarvajal
unregistered
posted 15 August 2000 03:26 PM           Edit/Delete Message   Reply w/Quote
Hello:
I need to use Skip Lot Sampling also for a new project....If somebody fromj you have experience from it, please let Montserrat know....

[This message has been edited by Marc Smith (edited 15 August 2000).]

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Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA
Registered:

posted 15 August 2000 06:26 PM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
Skip Lot is really Dock-to-Stock. In Dock-to-Stock, sooner or later your system should require a random or structured check.

A typical skip lot would be:

Inspect 3 lots. If OK, Dock-to-Stock for 5 shipments. Check the 6th shipment. If OK, Dock-to-Stock for 5 more shipments.

Continue as long as no nonconformances are identified.

If at any time time a nonconformance is identified, the inspection frequency is tightened - you define what 'tightened' is - such as inspect 3 shipments before returning to skip lot. Some systems are also set up to increase sample size when a nonconformance is identified.

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Drew H
Forum Contributor

Posts: 11
From:Kelowna, B.C., Canada
Registered: Oct 2000

posted 24 October 2000 06:24 PM     Click Here to See the Profile for Drew H   Click Here to Email Drew H     Edit/Delete Message   Reply w/Quote
Has anyone used AQL and skip lot systems to satisfy the Incoming Inspection requirements for QS-9000? We are considering using this as an interim measure for suppliers who are not yet certified, but our auditor is making grumpy noises.

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Montserrat P
Lurker (<10 Posts)

Posts: 7
From:San Nicolás de los Garza, NL. Mexico
Registered: Aug 2000

posted 24 October 2000 07:22 PM     Click Here to See the Profile for Montserrat P   Click Here to Email Montserrat P     Edit/Delete Message   Reply w/Quote
We are in the process to study the Skip Lot in one of our process, however, we have not thought about to implant it in the incoming inspection. Is the history of quality level of your suppliers so excellent to make the skip lot?
May I ask you, where did you find that information Sksp? I will appreciate to count on with more literature about it.

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Drew H
Forum Contributor

Posts: 11
From:Kelowna, B.C., Canada
Registered: Oct 2000

posted 24 October 2000 07:55 PM     Click Here to See the Profile for Drew H   Click Here to Email Drew H     Edit/Delete Message   Reply w/Quote
You should check out American Society for Quality - Statistics Division - Volume 4 "How to Perform Skip-Lot and Chain Sampling" by Kenneth Stephens.

The incoming quality varies - some suppliers are very good and skip lot will work; others will require constant incoming inspection. Question is, if the supplier has been shown to have adequate quality levels based on past history, but is not yet certified - will we be OK for our QS audit or is skip lot simply not allowed for QS incoming inspection? Hopefully our suppliers will be certified soon, but in the interim we need to do something and the cost of inspecting every shipment isn't justified for our good suppliers that are not yet certified.

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BenR
unregistered
posted 03 November 2000 01:00 PM           Edit/Delete Message   Reply w/Quote
You might check out Juran's Quality Control Handbook; he has a couple of pages on skip-lot schemes as does Montgomery in "Introduction to Statistical Quality Control." Also, you might search the web; seems like I found some good (and free) information of sampling a year or so back.

Good luck.

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