Wikipedia is an encyclopedia . Encyclopedias summarize knowledge , rather than try to contain all of it. While the promotional slogan "the sum of all human knowledge" is sometimes used to describe Wikipedia or its goal, that is an exaggeration. The world's knowledge is vast. Bigger than the collections of all libraries. Larger than the works of all publishing companies combined. Greater than the Internet. It is not Wikipedia's goal to duplicate all the effort that went into creating and maintaining those resources. Instead, Wikipedia provides introductions and overviews of notable subjects, to help alleviate the need to sift through all knowledge to understand the essentials. Once readers are familiar with the basics of a subject, and its jargon, they are better prepared to study and understand the rest of it.
In the brainstorming process, you’ll also want to consider the depth and breadth of your topic. Avoid topics that are extremely broad. For example, it would be difficult to write a paper that discusses the ‘Middle Ages.’ Why? Because The Middle Ages spanned a number of years and involved a variety of forces–cultural, religious, and political. Any attempt to cover such a broad topic as The Middle Ages would be futile. You’ll encounter too much research, and you won’t be able to cover everything in a paper-sized piece of writing. Tip: You may have to go back and forth between determining the scope of your paper and doing preliminary research.