A. The importance of overcommunicating.
Funny... I've had a friend who's been marked down at multiple companies for 'overcommunicating' - things like reiterating the todo list from a meeting out to everyone, and including people who couldn't be there but would be impacted, emailing a group with a question and to make sure everyone understands what the impact of XYZ will be. Most people hated it. Well, I was fine with it - I think there should be more of it, and I don't think most people really grok that in knowledge work, that's all you've got - communication. Making assumptions or ignoring/forgetting to notify some parties of XYZ have huge ramifications.