Specific recommendations are made concerning the circumstances under which the benefits of out-of-level testing outweigh the problems associated with it. Topics explored are: various methods for deciding when a set of test scores is invalid and the utility of these methods for local evaluators, the accuracy of vertical scaling, and the usefulness…

Rasch methodology facilitates effective achievement comparisons to meet evaluation needs at the district, school, classroom, and individual levels. The five-year District Gains Graph developed by the Portland (Oregon) Public Schools charts fall-to-spring achievement gains in basic skills for Grades 3-8, as measured by the Portland Achievement…