Factor 3:How does the practice of diagnostic assessment exemplify modern educational assessment? Modern educational assessment uses several different approaches to assess a student's knowledge in addition to the traditional practice of summative assessment. The practice of diagnostic assessment offers the educator the ability to understand the students' prior knowledge and misconceptions. These can then be used to adjust and differentiate instruction in addition can provide a template upon which a student's growth can be charted.The educator can build on prior knowledge and correct misconceptions as precursor to teaching the unit. In addition, gaps in knowledge can be identified as well as mastered material.