presentations should use the language and style of the audience - eg., technical people need technical evidence; sales and marketing people like to see flair and competitive advantage accruing for their own sales organization; managing directors and finance directors want clear, concise benefits to costs, profits and operating efficiency; and generally the more senior the contact, the less time you will have to make your point - no-nonsense, no frills, but plenty of relevant hard facts and evidence. See the presentation section for more guidance on this.