This is the Fifth Edition published in July 2021. At its most basic definition, the practice of law comprises conducting research to find relevant rules of law and then applying those rules to the specific set of circumstances faced by a client. However, in American law, the legal rules to be applied derive from myriad sources, complicating the process and making legal research different from other sorts of research. This text introduces first-year law students to the new kind of research required to study and to practice law. It seeks to demystify the art of legal research by following a ÒSource and ProcessÓ approach.