Communication is both one of the most important things to get good at if you want to build a well run, efficient company, and it is also one of the most underestimated things. [To be clear, I’m talking about internal communication with your employees.] Why is it so important? Let's put it this way: if one of your employees thinks you're in a canoe on a river and the other one thinks you're in a motor boat on a lake, they're going to be making very different choices about what they do every day. Even small differences matter — if someone is building a car and someone is building a bus, they may both have four wheels but it's a very different product and you make very different decisions to build it.