Ironic - you haven't given us any context, you haven't told us what kinds of audiences of colleagues you need to communicate with, what topics you need to talk about. Nothing.<p>The main point in communication is to determine who you are talking to, what information they need, what they already know, and then determine what you'll say.<p>Then you work out how to say it, and practise the delivery.<p>It's non-trivial, requires work, and doesn't come for free.