1. Ensure there is no blame for trying something new and messing up.
2. Make a point of warmly praising and celebrating when people own up to things that went wrong.
3. Hold a staff meeting where everybody declares a mistake they’ve made, to cheers from everybody else.
4. Be prepared to say “I got it wrong. That was my fault.”
5. Create environments where people can experiment, try new things and succeed, or – safely – fail.