Collect your research material and analyze it to find common themes. Each source will have a different take or perspective on the subject, but common themes will be addressed. Write down those common themes for each source.
Identify the most important common themes based on your understanding of the topic. The themes will provide the structure for your objective synthesis essay. Each theme will be a paragraph in a short essay or a section in a longer essay.
Create a grid or table of the common themes you have selected, based on theme and source. The grid will help you compare and contrast the themes visually and see the relationships between them.
Write a thesis statement. The thesis statement should describe the overall topic and summarize the common themes you will discuss in the body of the essay.
Organize the essay based on your common themes. Each paragraph or section should focus on one of the common themes you've identified. The paragraph or section should describe the theme as presented in each source. The essay is about the research you are citing, not the subject of the research. For example, an objective synthesis essay about global warming would not focus on global warming, but on the themes presented by various authors on the subject of global warming.
Write the paragraphs or sections objectively. You are reporting on the themes in your research material and giving equal weight to each perspective on that theme. The object is to tell the reader what the authors think, not what you think.
Conclude each paragraph or section with a closing sentence that transitions to the next paragraph or section. The closing sentence should summarize the different perspectives on that common theme.
End the essay with a paragraph that summarizes the overall perspectives of the authors on the subject. This summary should be based on the common themes you have identified and described in the essay.