Get a sampling plan ready for a QC inspection!

You want to perform a product inspection?
You want your procedure to be statistically valid?
Enter your information on this page and you’ll get what you need!
1. Find how many samples to draw at random
Total quantity of products: pieces (not sets or pairs etc.)
What inspection level do you choose?
How many samples you should draw: 315
What does it mean?
You select randomly 200 samples for inspection.
This is based on industry-accepted standard MIL-STD 105E (ISO2859; ANSI/ASQ Z1.4).
What kind of product is it?
How many days of work it should take: 2
What does it mean?
An inspector who checks carefully each sample would probably spend 2 days on this job.
If this is too long, you can change the inspection level above.
2. Find how many defects are acceptable
Defects are usually split into three categories:
Critical defects are a non-compliance with applicable law and/or might hurt users.
Major defects would cause a consumer/user to refuse buying the product.
Minor defects are a non-respect of specifications, but some consumers would not mind.
AQL for critical defects
AQL for major defects
AQL for minor defects
What AQL do buyers often choose?
For most consumer products: 0 for critical, 2.5 for major, and 4.0 for minor.
For more valuable items: 0 for critical, 1.0 or 1.5 for major, and 2.5 or 4.0 for minor.
These are the maximum numbers of defects that you can tolerate:
Critical defects: ≤ 0
Major defects: ≤ 14
Minor defects: ≤ 21
What does it mean?
If you find more defects than authorized in one (or more) category, inspection is failed.
Important note:
An inspection can be failed for reasons other than the number of visual defects.
Examples: not all products are presented; samples are not conform to requirements; etc.
You want to learn more about AQL and inspection levels?
>> Read this article: Quality Control Basics