Those interested in developing educational strategies and tests to measure what has been learned are often frustrated by at least some of the members of the class and their apparent difficulty learning what they are attempting to teach.
Remember that any classroom, whether brick and mortar or electronic, is filled with students with a range of intelligence, personal motivation, and numerous other factors. The instructor may be tempted to focus on those students who appear to be doing well while ignoring those students who frustrate them by their apparent inability to "get it.”
The sage instructor realizes the need to turn her or his attention in just the opposite direction, focusing on those students who appear to be having difficulties. While the intelligent student will certainly learn faster, with assistance and ample time the remainder of the class will catch up.
The instructor may have to evaluate students having difficulty to determine which teaching strategies work best for them. Perhaps some students have difficulty attending to a lecture strategy. A move to small group discussions pairing students who are doing well with students having difficulty may essentially level the playing field.
Finally, remember to focus on the target competencies and not just measurement of where students fall on the bell curve. If an instructor has been truly effective, it is possible for the entire class of students to obtain perfect scores on a posttest.