"We welcome the client’s input on the strategy and in exchange we ask him to grant us the freedom to explore various ways of executing it. This means we invite him to say, “That blue isn’t bold enough to deliver on our core value of strength.” But we explain that he is not invited to say, “Make it darker."

The Win Without Pitching Manifesto (http://www.winwithoutpitching.com/collaborating-with-clients)