Brunswik's Lens Model has been widely used in the modeling and analysis of judgment tasks and the Lens Model Equation has been an important part of most analyses. In such analyses, researchers often have based arguments and interpretations upon the magnitude of various components of the Lens Model Equation. One component is G, an index of agreement between a linear model of the subject's judgments and a linear model of the task environment. This paper addresses the index G and shows that while in principle -1 s G s 1, the distribution of G is often skewed towards high values so that caution must be used in the interpretation of its magnitude. Moreover, the results reported here apply to the relation between linear models in general.