The purpose of this article is to comment on a recent debate between Chara and Marks over the construct validity of the Vividness of Visual Imagery Questionnaire (WIQ). Following a description of their positions, it is argued that, although some of Chara's logical criticisms merit attention, much of his empirical work is methodologically unsound. However, in view of the nature of construct validity itself, it is also suggested that Marks ought to specify more clearly his concept of imagery vividness so critical experimental predictions can be made.
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