Six monographs on the Rasch model are summarized. The first gives a historical perspective on the application of the Rasch model in the Portland, Oregon, metropolitan area. The remaining papers summarize research on the Rasch model. The research in Monograph II lead to the conclusion that random samples are not needed to calibrate item levels in reading and mathematics. The research reported in Monograph III supported the contention that Rasch item levels are based on an equal interval scale. The research in Monograph IV concluded that students receive comparable achievement levels from different tests, provided that neither test is at a grossly inappropriate level. Research in Monograph V determined that a sample size of at least 200-300 students should be used to field test new items. Monograph VI dealt with the item calibration problems that might result if the range of the test were restricted, and concluded that the item calibration would not be significantly affected. (Author/BW)