Seth Goodin, a communication and marketing consultant, points out that there are two kinds of written communication and who your adience is helps you decide which style is appropriate. This may help you communicate about your organization or project.
When writing for strangers, make it short. Teach people gradually.
When writing for colleagues, make it robust--be specific, be clear, rigorous, leave no wiggle room.
Seth has a BLOG and you can read his post on Two kinds of writing.
Your ideas matter here--feel free to comment.