DS/EN ISO 4120:2007 ( Withdrawn )

Sensory analysis - Methodology - Triangle test

Replaced by:
Price from:
€ 61.03


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: 2007-10-26

Date of approval: 2007-08-07

Date of withdrawal: 2021-09-21

International relationships : EN ISO 4120:2007 IDT ISO 4120:2004 IDT

ICS: 67.240 - Sensory analysis

Item number: M216196



  • CEN/SS C01
  • ISO/TC 34/SC 12

Danish committee