“If we don’t disagree, we’re not going to produce good work. Disagreement does not have to be unkind. It does not have to be mean. You can do it with empathy, compassion and kindness,” says Amy E. Gallo, author of The Harvard Business Review Guide To Dealing With Conflict At Work. In science, for example, new theories are not just tested by experiment, but also challenged by other researchers. Alone, we easily fall into lazy thinking and gather arguments to reinforce our assumptions. Only by setting yourself the challenge of convincing others, of finding the weaknesses in their arguments, and letting them seek out the faults in your arguments, can you test out ideas.