A lot decision under an agreed plan
For an incoming lot of metal cosmetic applicator tips, acceptance sampling provides a basis for accepting or rejecting the lot under a defined inspection plan. NIST distinguishes this lot-disposition purpose from estimating the lot's quality. A passing decision does not demonstrate that every piece is defect-free, or that the actual defect percentage has been measured.
Agree what is being sampled
Define the lot, its identity and the inspection scope before selecting specimens. Choose samples through the agreed random-selection procedure rather than taking only the most accessible or best-looking pieces. Keep different component revisions and traceable production groups identifiable.
Specify the characteristics and defect classifications being assessed. Appearance, dimensions and assembly function require their own defined observations or measurements. An appearance check does not establish formula compatibility, and inspecting loose tips does not demonstrate retention in an assembled wand. Record the applicable sample size and decision rules for each scope.
Apply the acceptance rule accurately
For a single-sample attributes plan, the decision depends on the sample size and the acceptance and rejection criteria. A plan may permit some observed nonconforming units while still accepting a lot; acceptance must not be rewritten as 'all inspected pieces passed.' Record the actual counts and classifications.
Sample display room. This background view does not establish a component structure, test result or customer endorsement.
The AQL used to select or describe a plan is not permission to intentionally supply that percentage of defects in every lot. Nor does a zero-defect sample prove zero defects in the remainder. Sampling involves the possibility of accepting an unsatisfactory lot or rejecting a satisfactory one; the plan's performance must be considered across relevant quality levels.
Keep the report useful after acceptance
Retain the lot reference, selection method, sample size, inspection criteria, findings and disposition. Describe any limitations or incomplete checks. An accepted lot still needs appropriate process controls, handling and responses to later defects; a failed lot needs an agreed disposition rather than repeated sampling until it happens to pass.
NIST's Engineering Statistics Handbook provides the general acceptance-sampling principles discussed here. No numeric sampling table, cosmetic AQL or supplier inspection procedure is prescribed. Sambound's metal cosmetic applicator category provides the product context at sambound.com; this explanation does not report inspection results for an actual shipment.
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