The order of items above is the best order to present each part of the introduction: get the reader's attention, move toward the thesis statement, and then present the thesis statement. The thesis statement usually is most effective as just one sentence at the end of the introduction, so you should avoid presenting the thesis statement as the first sentence of the introduction and should avoid presenting the thesis statement in more than one sentence. (Information about thesis statements is presented on The Thesis Statement Web page.)
Common wisdom runs it’s better not to start at all, than to start poorly. Essay introduction is equally important in its rights as compared to the other parts of an essay. Your opening paragraph must win over readers’ endeavors to decide whether to read your work; it must set the tone for everything else in the paper announcing not only the subject but also the sort of the future audience. Readers must be literally wooed into reading a paper by more imaginative techniques than the blueprint beginning that simply gives a paper plan. But a few audiences may expect your opening paragraphs to outline everything you intend to do in your paper. Introductory paragraphs that summarize the paper to follow are especially popular among science writers. Such an outline of the scientific experiment is called an abstract in the scientific circles and is widely used in professional journals publications. It is up to you to decide what beginning is more appropriate in each particular case.