A discrimination test is a product test designed to show whether one product differs from another — the sensory analyst’s tool for answering “can people tell these apart?” Panellists receive coded samples and must pick the odd one out, as in the triangle test, or match pairs, as in the duo-trio test; statistics then decide whether the correct identifications exceed chance. The method is the gatekeeper of product change: before a manufacturer switches suppliers, reformulates to cut cost, or extends shelf life, discrimination testing checks that consumers cannot detect the difference. It asks nothing about liking — only about perceptibility — which makes it faster and more objective than preference tests. When a change passes discrimination testing, the business can proceed confident that, whatever else changed, the eating experience did not.