Abstract: The increasing publicity of Neurolinguistic Programming (NLP) has not been accompanied by marked research support. As a first review of the 15 studies performed so far that have investigated the use of the Preferred Representational System (PRS) in NLP, this article describes each of these studies, compiling a summary of data collected. Aspects of design, methodology population, and dependent measures are evaluated, with comments on the outcomes obtained. Results of the review suggest that there is little supportive evidence for the use of the PRS in NLP in these 15 studies, with much data to the contrary. Questions of accountability are raised.