Interpreting Changes in ICCs: To Agree or Not to Agree, That is the Question

In this chapter, we discuss Cohen and Doveh's (this volume) proposed protocol for testing differences in intra-class correlation coefficients (ICCs). We believe that there are many research questions that can be addressed by this procedure. We provide several potential examples of using this procedure at the individual, group, and organizational/society levels of analysis. We do, however, raise concerns about interpreting the ICC as an index of within-group homogeneity.