This post is part of the HBR Insight Center Making Collaboration Work.

Teamwork and collaboration are critical to mission achievement in any organization that has to respond quickly to changing circumstances. My research in the U.S. intelligence community has not only affirmed that idea but also surfaced a number of mistaken beliefs about teamwork that can sidetrack productive collaboration. Here are six of them.

Misperception #1: Harmony helps. Smooth interaction among collaborators avoids time-wasting debates about how best to proceed.

Actually: Quite the opposite, research shows. Conflict, when well managed and focused on a team’s objectives, can generate more creative solutions than one sees in conflict-free groups. So long as it is about the work itself, disagreements can be good for a team. Indeed, we found in our earlier research on symphony orchestras that slightly grumpy orchestras played a little better as ensembles than those whose members worked together especially harmoniously.

Misperception #2: It’s good to mix it up. New members bring energy and fresh ideas to a team. Without them, members risk becoming complacent, inattentive to changes in the environment, and too forgiving of fellow members’ misbehavior.

Actually: The longer members stay together as an intact group, the better they do. As unreasonable as this may seem, the research evidence is unambiguous. Whether it is a basketball team or a string quartet, teams that stay together longer play together better.

Misperception #3: Bigger is better. Larger groups have more resources to apply to the work. Moreover, including representatives of all relevant constituencies increases the chances that whatever is produced will be accepted and used.

Read the rest at Harvard Business Review.