[cniemira]

Another +1. "Nonviolent Communication" as well as "Crucial Conversations" can be life changers if you follow even a little of their guidance. The techniques I've picked up have helped me build stronger relationships with my spouse, my children, my customers, my employees, and my peers.

There are other books on communication, but these are my top two. They're actionable, in that they provide specific techniques as well as discussing thoery. Both books lay a similar foundation that any book on communication worth its salt will likely have in common: we're all emotionally driven beings and we communicate most effectively when we're able to separate observations from judgements.