Do not use this if a definition will not add useful information.
For example, you may state what a long-standing theory holds, then transition, with a word like "however" or "but," to describe the contrasting conclusions your research leads to.
This technique is particularly useful in argumentative essays or if you will be presenting your paper in a setting where alternate conclusions will also be proposed.
This guide is for quick and dirty paper writing - it probably contradicts everything your teachers have told you..it works.
The best scenario for writing a quick paper is when your professor allows you to pick your topic / thesis statement.
If your topic has multiple components, such as "teaching math to developmentally disabled kindergarten students," you can start with a sentence about one component and narrow it by adding another component in each sentence.
In this example, you might start with a broad statement about teaching math, then teaching math in kindergarten, then state your full thesis.
Like a physical funnel, a funnel method introduction starts broadly and gets progressively narrower to end with the thesis statement.
This technique provides a natural way to create a connection between your reader's broad familiarity with your field and your specific research topic.
If you develop your thesis too early, you may find that there's not enough to research to support it, it's too specific, it's super lame, etc. It usually gives a broad overview of the topic, then has an outline with a bunch of different topics that I usually steal for my own body outline.
Just make sure that you never plagiarize from Wikipedia.