A functional sample can answer a production question when it tests one defined requirement under stated conditions and is judged against predetermined acceptance criteria. ASQ identifies prototyping and lab testing among methods for evaluating supplier samples, while a quality control plan may specify product tolerances, testing parameters, and acceptance criteria.
Start with a testable question
A broad request such as “Is this material suitable?” is too broad to guide a useful test. A testable production question identifies the subject, the condition being examined, the expected response, and the decision the evidence must support.
Possible question forms include:
- Whether a prototype performs a specified function under defined conditions.
- Whether a sample remains within a stated tolerance after a defined process.
- Whether a sample meets specified requirements for its intended use.
These are question templates, not findings about a particular sample. Each should be narrow enough for the result to produce a clear conclusion.
Match the method to the question
ASQ’s supplier-quality resource lists prototyping, lab testing, and validation testing among methods for evaluating supplier samples. The selected method should match the production question rather than provide a general impression of suitability.
In general terms, prototyping can examine behaviour in a constructed form, lab testing can measure performance under controlled conditions, and validation testing can assess a sample against defined requirements for intended use. A different question may require a different method or additional evidence.
Define the decision rule before testing
The acceptance rule should be established before the result is interpreted. A controlled test record can address the following elements:
| Element | What it should identify |
|---|---|
| Production question | The exact decision the sample must inform |
| Sample | The particular sample and its condition |
| Evaluation method | The procedure used to examine it |
| Testing parameters | The conditions and settings applied |
| Product tolerances | The permitted variation |
| Acceptance criteria | The observable result required for acceptance or rejection |
| Scope limits | What the test will not establish |
ASQ specifically notes that a quality control plan may specify product tolerances, testing parameters, and acceptance criteria. Recording these points before testing helps keep the final interpretation tied to the original production question.
Interpret the result as bounded evidence
A passing result supports one conclusion: the tested sample met the stated criteria under the stated parameters. A failing result shows that it did not meet those criteria.
Neither outcome alone establishes performance for other batches, changed process settings, different materials, or untested uses. Those conditions would require separate evidence if they matter to the production decision.
Confirm the project-specific requirements
The cited ASQ material does not define a universal functional-sample method or a universal acceptance threshold. Before relying on the result, the maker must still confirm the applicable product specification or drawing, material identity, sample provenance, any required test method, tolerances, acceptance criteria, and intended use.
The cited material also establishes no Hong Kong-specific legal, certification, or approval requirement, so none should be inferred from this guide. Until the project conditions are confirmed, a functional sample provides evidence about its defined question—not a general verdict on production readiness.