The introduction is the first thing that your reader sees.
It is what invests the reader in your paper, and it should make them want to continue reading.
It also helps focus the reader on your central point.
An effective thesis establishes a tone and a point of view for a given purpose and audience.
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For a longer research paper, where you use an outline, it can be useful to structure your introduction around the outline. The introduction gives an overall review of the paper, but does address a few slightly different issues from the abstract.
It works on the principle of introducing the topic of the paper and setting it in a broader context, gradually narrowing the topic down to a research problem, thesis and hypothesis.
Here are some important things to consider when constructing your thesis statement.
The thesis is often located in the middle or at the end of the introduction, but considerations about audience, purpose, and tone should always guide your decision about its placement.