Re: "Know your audience.". Once, I've worked with one manager who didn't like data. We were working on a project that required end-user feedback. The manager did not want to listen to that feedback, but rather design what he felt the requirements should be, then go to the users to see what they thought of it. Fine, if you aren't talking about months of work and millions of dollars.
One great thing about good presentations and good data visualiation, it helps to build support and build the consensus needed to overcome narcissism.
Apple kept a big secret for a long time. It kept the image of telling consumers what they wanted, vs. doing research. Then the truth came out, they spent millions and millions on consumer research.
Board of directors of a big organization should not be interested in too much details as the senior management responsible for the project would have done its homework and would have then put up the project case for approval. But you are right in a way too; some board members might be curious because of the investment involved therein and may want to look at the details making visuals of much assistance
@Waqas, I second Noreen's question -- wouldn't visuals help telling the big picture? And I'll also toss in, as an aside really, wouldn't it be awfully irresponsible of a board to skimp over the details?!