Quality inspections and usage decisions: turning observations into an explained disposition

An inspection records evidence against the quality plan. The usage decision determines how inspected quantity is categorized: accepted, rejected, rework or scrap. Measuring a sample and disposing of the inspected lot are related but distinct steps.

DNA inspections select a production source and plan, record inspected quantity and sample size, measure the required characteristics and record defects. After saving and any required approval, Apply Usage Decision closes the inspection. The decision quantities must balance exactly to inspected quantity.

Measurement and disposition

An inspection records observations against the quality requirement. A usage decision explains the treatment of the inspected quantity. The two are connected, but a recorded measurement is not itself a complete account of what happens to the lot.

DNA inspections relate to the production source and quality plan. Characteristics and defects provide evidence for the decision. Required review or approval adds the relevant responsibility before the inspection reaches its final supported state.

Balancing the lot

For an inspected lot of 100, a decision of 90 accepted, 5 rejected, 3 rework and 2 scrap balances to 100. A decision totaling 98 leaves two units unexplained. Recording a sample size of 10 does not automatically mean only 10 units belong to the lot decision.

The categories explain the whole inspected population. A quantity left outside the decision remains unresolved. A quantity counted in two categories would overstate the disposition.

Sample and population

A sample size describes how many observations were taken under the plan. The inspected quantity describes the lot or quantity being evaluated. Their relationship should follow the company's quality method.

The system's ability to represent a sample does not establish that a particular sample size is suitable for every product or risk. The quality plan supplies the approved basis, and the actual readings provide the evidence.

Rework and scrap

Rework indicates that additional processing may make output acceptable. Scrap indicates a different final treatment. Rejecting output also needs the meaning defined by the supported process. These categories should reflect the actual decision rather than be chosen interchangeably to close a record.

The financial and operational consequences can differ. Material and time used on rework may add cost, while scrap reduces usable yield. Those consequences help explain production variance.

Traceable quality evidence

A useful inspection allows a reviewer to identify the source order, quality plan, inspected quantity, sample, observations, defects, decision, and responsible approval where applicable.

This evidence is valuable beyond acceptance. Repeated defects can reveal a process problem, supplier issue, or outdated specification. DNA's structured quality records help the business connect the immediate decision with longer-term improvement.