A thesis statement usually appears at the end of the introductory paragraph of a paper , and it offers a concise summary of the main point or claim of the essay , research paper , etc. It is usually a one sentence and it may occur more than once, they state "so and so" is "so and so".  The thesis statement is developed, supported, and explained in the course of the paper by means of examples and evidence . Thesis statements help organize and develop the system of proper writing. They are essential components of scholarly research papers.