High Quality Content by WIKIPEDIA articles! A casebook is a type of textbook used primarily by students in law schools. Rather than simply laying out the legal doctrine in a particular area of study, a casebook contains excerpts from legal cases in which the law of that area was applied. It is then up to the student to analyze the language of the case in order to determine what rule was applied and how the court applied it. Casebooks sometimes also contain excerpts from law review articles and legal treatises, historical notes, editorial commentary, and other related materials to provide background for the cases.