This book! A great introduction to transactional analysis and a very useful tool for disarming and defusing interpersonal strife.

This book helped me figure out that, in personal relationships especially, I could raise the discussion by one level and talk about the game I was playing in an effort to figure out why and get somewhere useful, emotionally. As in, "I think I'm just playing 'Why Don't You - Yes, But'. I need you to just listen to me while I vent."

Can't recommend enough.

EDIT: I should say that the edition I read seemed a bit sexist? I just ordered the new edition so we'll see if any of that text changed.