The United States Supreme Court decision in the Rodriguez case does not make unequal educational opportunity between students any less of a moral injustice. It is immaterial whether these students are in different school districts in the same state, or in different school districts in different states. There is a role for the federal government in reducing the permissible variance of educational expenditures between states. This interstate comparison of permissible variance cannot be easily accomplished without agreement on criteria and increased sophistication of statistical techniques. Several methodologies and criteria that might aid in the measurement of intrastate permissible variance are suggested. (Author)