Communication. It’s vital in every situation, but more importantly – when both or all understand and stick with the same plan. When someone changes things without reasoning or informing the other(s) and then gets disappointed because the other person or team isn’t doing right by their plan….well, that just isn’t good communication.
Executing on the goals as a team.
Stay on target. (Damn straight I had to do a Star Wars line)
It seems simple, I know. The sad fact is, many people don’t do communicate well. If you don’t have a good memory, it’s best to keep a journal to look back on. If you have to email yourself a reminder or put it on your online/desk/wall calendar – do so. You can’t expect others to read your mind. It will save time and relationships (work/love/friends/family).