Condensing Information for Non-research Papers
Most non-research papers can be summed up in a nutshell statement—a single sentence that boils down a paper to its essential main point and doesn't aim to capture details, supporting arguments, or types of proof.
One-sentence Summaries for Different Types of Papers
Each of these non-research papers summarizes its main point based on its overall purpose:
This paper argues that the "saving democracy" rhetoric surrounding the Gulf War was merely a mask for the U.S.'s interest in keeping oil prices down. (From a political science paper whose purpose was to construct an argument.)
Ethnography and ethnology are the preferred research methods of many anthropologists. (From an anthropology paper whose purpose was to inform others about a research methodology.)