Issue 40 (1) of the periodical Scientific and Technical Review, published by the World Organisation for Animal Health (OIE), is dedicated to 'Diagnostic test validation science', which is a key element in the effective detection and control of infectious animal diseases. The primary goal of this issue is to provide an up-to-date compilation of the relevant standards (OIE and non-OIE), scientific approaches and guidance documents for all stages of diagnostic test validation and proficiency testing, including design, analysis as well as clear, complete and transparent reporting of validation studies in the peer-reviewed literature. See https://www.oie.int/en/what-we-do/publications/scientific-and-technical-review/#ui-id-4 or contact [email protected] for more information.