Communication is our greatest gift and yet we have a tendency to not use it in its highest available form. One of the things that drew me to coaching individuals is the art of asking questions. I never assume that I know where our conversation may be leading but instead ask for clarity so I have full comprehension of the person's direction and affirmation of the conversation.
As a woman I can safely say that we have a tendency to always go to the "what ifs" department and assume the negative ending which tends to precipitate anxiety and false truths in our minds. What if in your organization you assume that everyone completes their tasks on time but it was never communicated what the expectations were for the task? Perhaps this would avoid unnecessary disappointment and failure on a subordinate's role. What if the person you are married with assumed there was something going on in the marriage that wasn't even remotely true because you collected all your assumptions and came to a false conclusion.
I think if we all operated with clear expectations in our relationships personally and professionally there would be no room for assumptions. Expectations may or may not be realized but then consequences can be shared if the clarity is in place. Assuming the individual has clarity is never a safe bet! I never realized how much I assume in the coure of a week until I stopped to analyze how my mind thinks. If you are a multi tasker it is very easy to move on to the next task without making sure all the details are in place for the previous task. Make sure you don't place assumptions on other people and then look for unrealistic outcomes. So enter the next conversation with those around you with clarity and you wont have to assume that it will go much better!