By telling your team what to do, you at some level are telling them that what they've done has not been successful. That's probably not what you mean. However, tell them why you want something, and ask for their help, and the underlying message is "you've done well in the past, so here's something new." Even when you put rules in place (governance rules, if you will), you can still educate as to the "why" and get more acceptance than you would otherwise. And, if you have the opportunity to get input, and adjust your rules with feedback, even better. Much better.