This document discusses the purposes and importance of reviewing related literature and studies for research. It provides information on establishing the current state of knowledge in the area being studied and identifying appropriate research designs, strengths and weaknesses of prior research, and how to avoid previous errors. The review also helps develop a theoretical framework and define the scope of the field, contextualize research questions, identify useful procedures, and prevent duplicating past studies. The document then outlines tips for effective note taking when reviewing literature, including starting with recent works and reading summaries first, taking direct notes on index cards, recording full citations, and distinguishing quotes from paraphrases.