Chapter 1 - Difference Methods

Abstract

This chapter outlines the various methods involved in difference testing and will include those that determine the difference between two (paired comparison), three (triangle) or four (tetrad) products. Some of these tests can be also categorised into overall difference tests and attribute-specific directional difference or AFC tests. Difference tests are methods which determine if there is a detectable sensory difference between the samples, whereas attribute difference testing determines whether there is as a perceived specified attribute difference between samples. The pros and cons of using each of these methods will be discussed.