...we fill in the gaps.

Pay attention to this on both sides.

1) Know that you are likely filling in some gaps or making some assumptions, when dealing with others, when you don't have all of the facts. 

* The best way to get the facts, is to ask. Pay attention to when you are assuming the truth. 

2) Know when you are leaving gaps in your own communication with others. Whenever possible, fill in those blanks so the other party doesn't have to.