In the classroom environment, it may often appear that the main purpose of presentations is to inform, to supply knowledge, to teach. The accountant is not selling used cars, or snake oil. Decisions are frequently made based on perceptions. You need to be believed, so that you can persuade people to take the actions you want them to take. The best technical advice on accounting issues is useless unless you are able to convince your clients of your abilities and persuade them to follow your recommendations.
People buy people .
The key to success is credibility. They represent the difference between pointless embarrassment and successful professional practice. Persuasive communication is achieved when the message is received, understood, accepted and actioned. This is not just a matter for inexperienced students. Successful partners in major CPA firms and CEOs of large corporations will often rehearse important client presentations.