Introduction

In the read Elements of Rhetoric by Richard Whately we saw the many kind of introduction that we can use for start an Essay.
Introduction is the most important part of an essay (because it summarize the argument of a paper). It is also the most difficult part of a paper (because a person can have few ideas about the topic, but doesn't know how to start it).
The introduction summarize the main points that we will illustrate in the paper. Is important that the introduction is divided in parts, every part have to explain clearly the point that we going to illustrate, that means that if in the introduction we illustrate point 1,2, and 3, in the paper they must have the same chronological order.
Introduction is as a map for the readers, through it, readers understand what are the point of the papers, consequently more interesting are the points of the introduction more possible is that readers will not be bored.