Third-party testing: difference between revisions
Diff·revision 5 → 6·23:37, 9 Aug 2024
Difference between revision 5 and revision 6 of Third-party testing. 2 lines changed; the page grew by 285 bytes.
| Revision 5 — 13:40, 25 Jul 2024 Peptide_Pete (talk) correct the description of how lot identifiers are assigned 2,441 bytes +535 | Revision 6 — 23:37, 9 Aug 2024 UnderfillUna (talk) label the community tally as self-reported at this point of use as well 2,726 bytes +285 | ||
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| 10 | The distinction matters because the incentive structure differs. A supplier commissioning analysis of its own material controls which sample is submitted, whether an unfavourable result is published, and how the result is described. A purchaser commissioning analysis of material already received controls none of those things but is testing a sample of unknown representativeness.{{r|reports}} | 10 | The distinction matters because the incentive structure differs. A supplier commissioning analysis of its own material controls which sample is submitted, whether an unfavourable result is published, and how the result is described. A purchaser commissioning analysis of material already received controls none of those things but is testing a sample of unknown representativeness.{{r|reports}} |
| 11 | 11 | ||
| + | 12 | Independent testing is therefore evidence about a sample rather than about a lot, and about a lot rather than about a supplier. Treating a single favourable independent report as a general statement about an organisation is the commonest error made with these documents.{{r|reports}} | |
| + | 13 | ||
| 12 | == What an independent report establishes == | 14 | == What an independent report establishes == |
| 13 | An independent report establishes, at most, the properties of the material that reached the laboratory. Whether those properties can be extended to the lot the material came from depends on how the sample was drawn, and whether they can be extended to the supplier depends on how many lots have been examined and over what period.{{r|usp1503}} | 15 | An independent report establishes, at most, the properties of the material that reached the laboratory. Whether those properties can be extended to the lot the material came from depends on how the sample was drawn, and whether they can be extended to the supplier depends on how many lots have been examined and over what period.{{r|usp1503}} |