fitness for purpose 

Synonym: fitness for intended use
https://doi.org/10.1351/goldbook.08073
Ability of a product, process, or service to serve a defined purpose under specific conditions.
Source:
PAC, 2021, 93, 997. (Metrological and quality concepts in analytical chemistry (IUPAC Recommendations 2021)) on page 1025 [Terms] [Paper]