In this module, I have learned that diagnostic assessment provides instructors with information about what the student brings to the course, assignment, or project. This type of assessment may also assist instructors in grouping students who are more fluent in the area of learning with those who are not as informed. Thus, diagnostic assessment not only provides a view of existing knowledge, skills, etc., but reveals the range of knowledge and individual differences, and indicates modifications that need to be made based on this information.