= The International Harmonized Protocol for the proficiency testing of analytical chemistry laboratories by Michael Thompson and others
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{tag=Work by Michael Thompson}
Primary source: https://publications.iupac.org/pac/78/1/0145/index.html
Verified locator: Pure and Applied Chemistry 78, 145–196 (2006), DOI 10.1351/pac200678010145. Full primary report inspected via governmental mirror https://www.sfda.gov.sa/sites/default/files/pdfs-files/HarmonisedProtocolProficiencyTesting.pdf . Byline Michael Thompson, Stephen L. R. Ellison and Roger Wood. Appendix 1 A1.1 printed p. 177 recommends at least ten random containers and duplicate test portions in randomized measurement order; A1.2 gives ANOVA estimates; §3.11.2 p. 171 distinguishes sufficient homogeneity from zero sampling variance.
Measurement-order locators: Appendix 1, A1.1 (printed p. 177) requires randomized analysis of duplicate portions and checks for suspect trends; A1.3 (printed pp. 179–180) gives detailed laboratory instructions, including randomized order for the analytical operations. These support separating material variation from time-dependent analytical effects. Inspected primary report mirror: https://www.sfda.gov.sa/sites/default/files/pdfs-files/HarmonisedProtocolProficiencyTesting.pdf .
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