This document provides an overview of what a synthesis is and how to write one. It defines a synthesis as a written discussion that draws on two or more sources and depends on inferring relationships among sources. It explains that to write a synthesis, one must summarize sources, make judgments about them critically, reach conclusions based on source quality and validity, and determine relationships among sources. The document distinguishes between explanatory and argument syntheses, noting an argument synthesis aims to persuade while an explanatory synthesis provides information. It provides tips for writing an effective argument synthesis such as including a claim, evidence, assumptions, addressing counterarguments, using concession, and avoiding common fallacies.