Inspecting criteria needs

Good day Qualmx,

Sampling is a big subject. One answer does not fit all needs. Primary considerations in setting up a plan include, in no particular order:

1. Your customer's acceptance of the practice
2. The cost of missed defectives
   
3. The process should be in a state of control: that is, running consistently without the need for frequent intervention(s)
4. Is the process running in batches/runs/lots, or continuous?
5. If running in batches or lots, how many parts in each batch, run or lot?
   
6. The amount of risk you are willing to accept; Acceptable Quality Limit (AQL) is established based on ramifications of missing defective parts

There is a specification for sampling. In North America we still use ANSI/ASQ Z1.4. This link also shows links to other books. At this stage, I suggest Acceptance Sampling in Quality Control or the Certified Quality Engineer Handbook, though the Certified Quality Technician's Handbook is also good.

Affiliation note: I am a member of ASQ.