There are many challenges to providing validity evidence for CAT tests because of its uniqueness compared to fixed form tests. This study, using real data, provides empirical evidence of construct and invariance construct of MAP scales across grades at different academic calendars for 10 different states. Results show theconsistency and reasonableness of interpretation of the MAP RIT scale across grades and academic calendar years for the different states.

By Shudong Wang, Marth S. McCall, Hong Jiao and Gregg Harris