A thesis statement is a non-focused section of text which clearly delineates the argument that will be presented in a proposed paper. A thesis statement should be prepared in advance for all types of scientific writing, and can be anywhere from just one sentence to many pages in length. A thesis statement answers a research question.
It is a useful instrument for investigating the scope of the proposed paper in order to determine if it is too broad or too narrow. It is not intended to remain fixed, but can be adapted throughout the process of writing the paper as new arguments are discovered or old arguments are deemed to be irrelevant.
The thesis statement is often used in an adapted form at the beginning of the finished paper. It is considered to be better writing not to introduce the thesis statement with the words "The purpose of this paper is to..." but to reword it to make clear what will be following, and thus it is often found after a brief motivation for writing the paper. (Wikipedia)
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