Gathering pretest data from entering students enables matched pairs analyses of pretest and posttest data in which each individual’s posttest is compared with that same individual’s pretest. For this method of analysis to be successful, it must be possible to match pretest and posttest for the same individual. Hence a coding system of some kind is needed, e.g. ID number, investigator designated code number, or test-taker name. Matched-pairs analysis is not the only method of pretest to posttest analysis; contact Insight Assessment educational testing specialists to discuss the specific requirements of your project.