DS/EN ISO 4120:2021

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

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This International Standard describes a procedure for determining whether a perceptible sensory
difference or similarity exists between samples of two products. The method is a forced-choice
procedure. The method is applicable whether a difference exists in a single sensory attribute or in
several attributes.
The method is statistically more efficient than the duo-trio test (described in ISO 10399), but has
limited use with products that exhibit strong carryover and/or lingering flavours.
The method is applicable even when the nature of the difference is unknown [i.e. it determines neither
the size nor the direction of difference between samples, nor is there any indication of the attribute(s)
responsible for the difference]. The method is applicable only if the products are fairly homogeneous.
The method is effective for
a) determining that
– either a perceptible difference results (triangle testing for difference), or
– a perceptible difference does not result (triangle testing for similarity) when, for example, a change
is made in ingredients, processing, packaging, handling or storage;
b) or for selecting, training and monitoring assessors.

Number of pages: 28

Published: 2021-03-24

Date of approval: 2021-03-22

International relationships : EN ISO 4120:2021 IDT ISO 4120:2021 IDT

ICS: 67.240 - Sensory analysis

Item number: M341678



  • CEN/SS C01
  • ISO/TC 34/SC 12

Danish committee