ONORM EN ISO 4120:2021

Sensory analysis - Methodology - Triangle test (ISO 4120:2021)

This document specifies a method for determining whether there is a perceptible sensory difference or similarity between the samples of two test materials. The procedure is based on the "forced choice" principle. The method is applicable if there is a difference in a single sensory feature or in several features. The method is statistically more meaningful than the duo-trio test (described in ISO 10399), but has a limited application to test materials that leave strong overlapping and/or post-acting olfactory/gustatory impressions. The method is also applicable if the nature of the difference is unknown (i.e. it does not determine the size or direction of a difference between the samples, nor does it provide indications of characteristics responsible for the difference). The method is only applicable if the test materials are homogeneous. The method is suitable for a) the ...