A synthesis is a written discussion that draws on one or more sources. It follows that your ability to write syntheses depends on your ability to infer relationships among sources – essays, articles, fiction, and also non-written sources, such as lectures, interviews, observations. This process is nothing new for you, since you infer relationships all the time – say, between something you’ve read in the newspaper and something you’ve seen for yourself, or between the teaching styles of your favorite and least favorite instructors. In fact, if you’ve written research papers, you’ve already written syntheses. In an academic synthesis, you make explicit the relationships that you have inferred among separate sources.
Clearly, before you’re in a position to draw relationships between two or more sources, you must understand what those sources say; in other words, you must be able to summarize these sources. It will frequently be helpful for your readers if you provide at least partial summaries of sources in your synthesis essays. You should already have drawn some conclusions about the quality and validity of these sources; and you should know how much you agree or disagree with the points made in your sources and the reasons for your agreement or disagreement.
Because a synthesis is based on two or more sources, you will need to be selective when choosing information from each. What you as a writer must do is select the ideas and information from each source that best allow you to achieve your purpose.
Your purpose in reading source materials and then in drawing upon them to write your own material is often reflected in the wording of an assignment. For example, your assignment may ask that you evaluate a text, argue a position on a topic, explain cause and effect relationships, or compare and contrast items. While you might use the same sources in writing an argumentative essay as your classmate uses in writing a comparison/contrast essay, you will make different uses of those sources based on the different purposes of the assignments.
Your purpose determines not only what parts of your sources you will use but also how you will relate them to one another. Since the very essence of synthesis is the combining of information and ideas, you must have some basis on which to combine them. Some relationships among the material in you sources must make them worth synthesizing. It follows that the better able you are to discover such relationships; the better able you will be to use your sources in writing syntheses. Your purpose in writing (based on your assignment) will determine how you relate your source materials to one another. Your purpose in writing determines which sources you use, which parts of them you use, at which points in your essay you use them, and in what manner you relate them to one another.
Hopefully after reading this, you have got a concise idea as to how a synthesis essay is written. You have an idea as to how to select a topic, form the outline and present your ideas in a serial and coherent manner. Remember that practice makes everything perfect, so here are some practice topics that might help you in honing your skills.