There has been a growing awareness as to the need of knowledge to improvc public speaking and interpersonal communication. When limiting our consideration to two essential elements contributing to efficient public speakiog, i.e. the strength of argumcntation and voice modulation of the text, one becomes aware of how important argumentation is. It is necessary for a speaker to fonn efficient arguments by taking into account his or her ethical features. Further, there are at least five types of argumentation (deduction, induction, analogous, causative and referential concluding). There is a need, on the other hand, to avoid sly and dishonest argumentation (evasion, dangerous speculations, ... etc.). Nevertheless, the argumentation alone does ...