Mixture modeling is a widely applied data analysis technique used to identify unobserved heterogeneity in a population. Despite mixture models' usefulness in practice, one unresolved issue in the application of mixture models is that there is not one commonly accepted statistical indicator for deciding on the number of classes in a study…

Project Information Packages (PIPs), kits containing directions for the replication of exemplary remedial programs, were field tested in a number of school districts. Based on curriculum analysis and site visits PIPs were found to induce projects which were adequate copies of what was packaged; however, what was packaged was not sufficient to…