a method and system for grading free response tests including the use of highly accurate machine - readable data codes to uniquely associate test - taker , test and reader / grader , and a portable sensing device which stores codes read by the device for subsequent entry into a host computer . the method permits multiple readers / graders to evaluate the same test without one reader / grader influencing another , while reducing paper handling and key entry of data inherent in large volume paper and pencil testing techniques .