Teachers can use graded assignments daily, weekly or by unit to monitor a students comprehension of the material. Generally, these are done with worksheets, homework or exams. Teachers can be creative, especially with younger students, on ways to monitor this knowledge. But, by assigning a point value to knowledge based performance, a teacher can easily compare students from any given class to quickly see those that are struggling or those that excel. Obviously, this method doesn't address particular issues a student might have such as ADHD or anxiety, but it can be a quick and useful tool. It is almost always required by schools to use this tool for assessing students. It is a quick way to get a snapshot of a students understanding on a given subject.