Is when a student who is proficient in a subject helps a struggling student. There are clear advantages to both parties in peer tutoring: The tutor gains a deeper level of understanding through expanding on prior knowledge. This happens through summarizing, paraphrasing, and visualizing the subject matter for the tutee.
A means to measure the validity or effectiveness of a given evaluation method by comparing the scores in one test to those of another. The degree of accuracy of a test increases the closer its scores correlate to the scores of another assessment criteria of a related attribute.