Internal Audits

Reporting, best practices, non-compliance reporting


If 2nd or 3rd party performs full system audit on my QMS, can it be used as to satisfy requirement for Internal Audit of that year?


Thank you for sending your question to ASQ’s Ask The Experts program.

My first response to your question would simply be, no you cannot use a 2nd or 3rd party audit to satisfy the requirement for Internal Audits.

The thing to consider is, who will the final Audit Report go to? That is, who is the customer?  An Internal Audit is conducted to your QMS and to your criteria. The final report would generally be directed to senior management.

A second or third party audit is most often performed by a customer or by a registrar. They would be guided by different criteria. A customer audit would not be of your entire QMS or give evidence of its overall efficacy. It would be inspired by what would be pertinent to the product or service you provide to them. A registrar audit would be to verify your facility’s compliance to standards but not necessarily the entire QMS.

You can see how this would be leading down a path one wouldn’t want to follow.  Therefore, Internal Audits should remain . . . internal.

Bud Salsbury, CQT, CQI

For more on this topic, please visit ASQ’s website.

Sample Size

Manufacturing, inspection, exclusions


If we have a lot size of 27 and we are using a normal inspection level II with an AQL of 2.5. What is the sample size?


Assuming an attribute is being measured, we use ANSI ASQ Z1.4.2013 to find the sample size.

Given a lot size of 27 we first find in Table I. Sample Size Code Letter that Code letter D represents the sampling plan code letter for lot sizes between 26 and 50 for normal sampling (General Inspection Level II).

The move to Table II-A Single sampling plans for normal inspection to find the row for code letter D and under column for ASQ 2.5 find an up arrow. This indicates that we should use the code letter C which suggests a sampling plan of 5 samples and accept the lot if there are zero defect and reject the lot with one or more rejects.

Hope that helps.



Fred Schenkelberg
Reliability Engineering and Management Consultant
FMS Reliability
(408) 710-8248

For more on this topic, please visit ASQ’s website.