Employee psychological safety. That the three hardest phrases for a knowledge worker to say: “I was wrong”, “I made
a mistake” and “your idea is better”. Our team-mates have to be “psychologically safe” in order to say these phrases.
Being respectful of our team-mates and their ideas (we stole the idea of saying “yes, and ...” rather than “No.” from improv.)
Good hiring and that we should try to weed out potential employees suffering from the "Not Invented Here" syndrome.