The Social Relations Model (SRM) partitions social perceptions into perceiver, target, and relationship effects. The SRM presumes that variability in these effects is consistent across perceivers and targets—that there is the same level of variability in their perceiver, target, and relationship effects. We introduce the extended SRM to examine individual differences in each component of the SRM. To do so, we separate the tendency for perceivers to see targets in different ways, called Dissimilation, into two novel constructs, Sensitivity and Differentiation. Similarly, we separate the tendency for targets to be viewed in different ways, called Dissensus, into two novel constructs called Prototypicality and Volatility. In three studies, we show theutility of this separation for understanding how perceivers use rating scales, the accuracy of judgment, and the meaning of the perceiver effect. The new model is discussed in relation to Funder’s Realistic Accuracy Model and Biesanz’s Social Accuracy Model.