"In a [literature] review organized thematically, you group and discuss your sources in terms of the themes, theoretical concepts, and topics that either you decide are important to understanding your topic or that you have identified from reviewing the key studies on your topic. This structure is considered stronger than the chronological organization because you define the theories, constructs, categories, or themes that are important to your research. ... In these types of reviews, you explain why certain information is treated together, and your headings define your unique organization of the topic. The sequence of the concepts or themes should be from broad to specific."
(Sally Jensen, 09 September 2013)
"A literature review is a survey and discussion of the literature in a given area of study. It is a concise overview of what has been studied, argued, and established about a topic, and it is usually organized chronologically or thematically. A literature review is written in essay format. It is not an annotated bibliography, because it groups related works together and discusses trends and developments rather than focusing on one item at a time. It is not a summary; rather, it evaluates previous and current research in regard to how relevant and/or useful it is and how it relates to your own research."
(Saint Mary's University)