A diagnostic assessment is a form of pre-assessment where teachers can evaluate students’ strengths, weaknesses, knowledge and skills before their instruction. An identical assessment may be given post-instruction to identify if students have met a course’s required learning objectives. With this form of assessment, teachers can plan meaningful and efficient instruction and can provide students with an individualized learning experience. Written by students, the diagnostic assessment is a tool for teachers to better understand what students already know about a topic when submitted before the start of a course.