How do you avoid candour turning into bullying?

Being frank and open to each other at work should theoretically be a no-brainer. Of course it will lead to top performance and high quality service if people can say what they think! Or will it? Candour turns out to be a highly sensitive subject.

Firstly it turns out that it is not so easy to be open with each other. And secondly, openness also has its dark and downsides.

As always, our Punks share their open and honest views on the subject. How do you deal with candour at work?