lol!you need to have a good listenin mode (not hearing mode)...for both of them ...<br />
and if practised it becomes a SKILL!
Interpersonal has more to do with the type of relationship you have with a person in context of a longer term. How you act and react to them over time, through different situations, etc.<br />
Communication skills is just about how well you can represent what you are thinking so that others understand you. Here's a cute quote for you on this subject:<br />
"I am responsible for what I say. I am not responsible for what you understand." :)