The most typical ancient design of book consists of an introduction, main part, derivation. This routine often have an info address, a written report. Today, inviting trade speeches differ in free composition, largely based on the problem together with addressee.

During tests, it had been discovered that what exactly is best appreciated and assimilated is provided in the beginning. At or message, this is as a result of motion associated with the so-called psychological law from the « edge. » Therefore, it is essential to take into account the articles on the introduction and derivation.