Write the thesis sentence. Also referred to as the topic sentence, it tells the reader what the essay is about. The thesis sentence can occur anywhere in the introduction. If you are an inexperienced writer, it is advisable to begin the intro with the thesis sentence.
Write two or three sentences that narrow the topic. These should support the thesis and give the reader a clear idea of what will be discussed in the body of the essay.
Write sentences with simple and concise words. Most readers will not be impressed with overblown language and will be confused if they do not know what the words mean.
Create interest with the intro but do not include information that is not expounded upon in the body. The introduction is a preview of upcoming details, not a forum for generalizations or philosophical platitudes.
Read your intro again after the essay is completed. Use it as a guide to be sure the body of your writing reinforces the main ideas and does not deviate from the introduction.