THURSTONE AND SENSORY SCALING - THEN AND NOW

Following a brief summary of the major ideas and assumptions of Thurstone's (1927a) ''A Law of Comparative Judgment'' and a discussion of its historical context, this article reviews the subsequent major developments of this model in the sensory area. They are grouped as (a) response criteria, which Thurstone incorrectly believed to be of little significance, (b) several interpretations of the underlying continuum, (c) extensions of his formalism to choice and absolute identification, (d) the possibility of non-Gaussian distributions, and (e) extensions to multidimensional representations.