Upon learning that a form of the Sequential Tests of Educational Progress was incorrectly distributed to an unidentified number of high school students along with an answer sheet pregridded with an alternate test form, the Austin Independent School District performed the following research analyses: (1) scored the tests using the key for each form, calculating a daily total raw score; (2) Rasch-calibrated the tests using the key for Form B, the form the students were supposed to have taken; (3) obtained an average person-fit statistic for each day; (4) created a file which included, for both days of testing, the average person-fit score and the total raw score for both Forms A and B, and also the person-fit scores for each subset; (5) sorted the file by Day 1 average person-fit score and print; (6) sorted the file by Day 2 average person-fit score and print; and (7) examined the output. Six samples illustrate the case types found. Apparently 63 of 65 booklets were used with 78 students taking Form A at least one day. However, there is no empirical evidence to suggest what kind of error rate there is with this procedure. (PN)