The principle purpose of the introduction is to present your position this is also known as the "thesis" or "argument" on the issue at hand but effective introductory paragraphs are so much more than that. Before you even get to this thesis statement, for example, the essay should begin with a "hook" that grabs the reader’s attention and makes them want to read on. Examples of effective hooks include relevant quotations ("no man is an island") or surprising statistics "three out of four doctors report that…".
Only then, with the reader’s attention "hooked," should you move on to the thesis. The thesis should be a clear, one-sentence explanation of your position that leaves no doubt in the reader’s mind about which side you are on from the beginning of your essay.
Following the thesis, you should provide a mini-outline which previews the examples you will use to support your thesis in the rest of the essay. Not only does this tell the reader what to expect in the paragraphs to come but it also gives them a clearer understanding of what the essay is about.
Finally, designing the last sentence in this way has the added benefit of seamlessly moving the reader to the first paragraph of the body of the paper. In this way we can see that the basic introduction does not need to be much more than three or four sentences in length. If yours is much longer you might want to consider editing it down a bit!
The middle paragraphs of the essay are collectively known as the body paragraphs and, as alluded to above, the main purpose of a body paragraph is to spell out in detail the examples that support your thesis.
For the first body paragraph you should use your strongest argument or most significant example unless some other more obvious beginning point as in the case of chronological explanations is required. The first sentence of this paragraph should be the topic sentence of the paragraph that directly relates to the examples listed in the mini-outline of introductory paragraph.
A one sentence body paragraph that simply cites the example of "George Washington" or "LeBron James" is not enough, however. No, following this an effective essay will follow up on this topic sentence by explaining to the reader, in detail, who or what an example is and, more importantly, why that example is relevant.
Even the most famous examples need context. For example, George Washington’s life was extremely complex by using him as an example, do you intend to refer to his honesty, bravery, or maybe even his wooden teeth? The reader needs to know this and it is your job as the writer to paint the appropriate picture for them. To do this, it is a good idea to provide the reader with five or six relevant facts about the life in general or event in particular you believe most clearly illustrates your point.
You may have noticed that, though the above paragraph aligns pretty closely with the provided outline, there is one large exception: the first few words. These words are example of a transitional phrase – others include "furthermore," "moreover," but also "by contrast" and "on the other hand" – and are the hallmark of good writing.
Transitional phrases are useful for showing the reader where one section ends and another begins. It may be helpful to see them as the written equivalent of the kinds of spoken cues used in formal speeches that signal the end of one set of ideas and the beginning of another. In essence, they lead the reader from one section of the paragraph of another.