"Everything we hear is an opinion, not a fact. Everything we see is a perspective, not the truth. -Marcus Aurelius
In business and in life most of us operate on the assumption that other people understand what we are thinking and what our intentions are. We believe, for the most part, that they see the world as we do. Often these delusions are harmless and can be attributed to basic human nature, which includes the idea that we are the center of the universe and that our own personal reality is somehow commonplace.
I remember once my 6th grade teacher told me he was going to give me the secret to success in a nutshell, or at least a major contributing factor. He said, "there is one thing you must never do when walking into any situation, on thing to refrain from if you are to truly become a successful person. Never ever assume."
I try and think about that every time I walk into any situation. Just think about all of the unpleasant confrontations or costly mistakes that could have been avoided if we didn't assume and communicated more effectively. Just because you understand something a certain way doesn't mean that everyone else will share your vision. This is especially true for leaders and entrepreneurs. It is our job to communicate our vision to others so that they truly understand what ever it is we are tying to accomplish. Write it on your bathroom mirror, post it on your fridge, create a reminder on your smart phone to remind yourself on a daily basis, to never assume anything.