Beware of the temptation to open your final paragraph with "In conclusion," or "In summary," and then summarize the paper. Instead, let your entire conclusion stand as a graceful termination of an argument. As you write your conclusion, concentrate on presenting the bottom line, and think of the word’s definition: a conclusion is an articulated conviction arrived at on the basis of the evidence you have presented.
Just by considering the section headings in the above examples, we can begin to see the fundamental structures and directions of the essays, because both sets of headings break the paper topic into its natural parts and suggest some sort of a movement forward through a topic. Note how these headings—as all section headings should—tell us the story of the paper and are worded just as carefully as any title should be.
As examples, I offer two sets of section headings taken from essays. The first is from Dr. Craig Bohren’s "Understanding Colors in Nature" (1), which appeared in a 1990 edition of Earth & Mineral Sciences; the second is from a student’s paper on the supply and demand of asbestos.
As examples of how creative an introduction can be, here are the opening lines from a geography paper and a paper on optics, both of which use narrative technique to arouse our interest. Note how the first excerpt uses an "I" narrator comfortably while the second excerpt does not use "I" even though the writer is clearly reflective about the subject matter. The first excerpt is from a paper on the generic nature of America’s highway exit ramp services; the second is from a paper on shape constancy.
When you are first faced with the task of writing a long essay or term paper it can be intimidating, but you make your job and the reader’s job much easier by following some basic rules of thumb. Of course, if your professors offer you any specific guidelines about writing be sure to follow those first. Otherwise, incorporate the advice that follows into your papers wherever appropriate.