The CCR ID Cleanup file is a trial created by DESE that includes each student that has taken any assessment (ACT, AP, PLTW and SAT) during the year, and it compares the record against the MOSIS ID system to obtain the MOSIS IDs for each student. The students that are not matched are then added to a file that is preloaded into MOSIS for every district or charter in the state containing the student records that do not have a MOSIS ID. The process is essentially the same process used with the MAP records for the June ID Cleanup (last two weeks in June). It is essential to review and certify both trials when they become available.