From the Editor
Journal of Direct Instruction
One of the central issues of research is making an appropriate comparison. Results from a treatment are meaningless by themselves. To have meaning, they must be compared to something. Knowing that a student got 10 items correct on a test tells us nothing unless we have some context for comparison; that context could be a mastery criterion, the student’s performance on a pretest, the performance of similar students, and so on. Each of these kinds of comparisons gives different kinds of meaning to the raw score.
Slocum, T. A. (2002). From the editor. Journal of Direct Instruction, 2, 1-2.