Similar in spirit to the single responsibility principle that we use when coding, our communications should ideally only be about one thing at a time. This greatly improves understanding among participants and will ensure that any decisions that are made relate specifically to the matter at hand. Additionally, keeping meetings or communications short ensures that people will be able to pay attention for the entire duration. Long meetings, just like long emails, eventually cause boredom and irritation. And with each topic or tangent added, the chances of each item being individually resolved dwindles massively. It's important to remember this when raising issues and bugs as well. Keep it simple.