Model for studying the decision rules used by human decision-makers, first proposed by E. Brunswik in the early 1950s. Conceptually, the model characterizes the decision process as the selection and evaluation of cues in the assessing of reality. Which cues are used and how they are weighted are central to this model. The term lens model springs from the sense that subjects view reality through the lens of these cues. This approach has been applied in the study of PDD decisions at the University of Utah. The lens model is useful to assess the diagnosticity of physiological responses, in identifying how examiners use the physiological information, and to determine the combination and weights of the cues that will maximize decision accuracy. See: Kircher, Kristjansson, Gardner & Webb (2005); Kircher & Raskin (1983); Kircher, J.C., Raskin, D.C., Honts, C.R., & Horowitz, S.W. (1995).