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Alternative forced choice

Last modified at 2/2/2021 2:37 PM by Maren Johnson

Alternative forced choice (AFC) test

Alternative forced choice (AFC) test is defined by ASTM International1 as:
“alternative forced choice (AFC) test, n—method in which 2, 3, or more stimuli are presented, and assessors are given a criterion by which they are required to select one stimulus. (2008) DISCUSSION—Typical examples include 2-AFC (directional different test) and 3-AFC (selecting the one stimulus among a set of three that differs in a defined attribute).”


1 ASTM International. 2009. Standard Terminology Relating to Sensory Evaluations of Materials and Products, E253-09a. ASTM International, West Conshohocken, PA. E253-09a