Hi Mustafijur: Sometimes a teacher is locked into using an established system for grading. When that's not the case, you want to make sure that your grades reflect the learning that has occured. Sometimes that's very difficult to measure and therefore, grading becomes a bit more difficult. If all lessons are based on well written student learning objectives (outcomes), then the instructor can construct tests that measure those outcomes. That makes grading a whole lot more objective. too. Regards, Barry