The answer lies in one sentence, separated into four parts. We surveyed over 1000 professionals from every type of business, government agency, and non-profit organization. In a word - Diversity. Demographic diversity and more. Different job histories, professional experiences, lengths of employment, educations, specializations, thinking styles, approaches to problem solving.
Teams require complementary skills - so that each member adds value and completes the team.
With A Common Purpose Mission, Vision, Strategic Plan, Objective, Quality Statement, Goal. Whatever you call it - have the Team participate in authoring it. One sentence or one page in length. Write it down, make copies, and wallpaper the facility with it. Put it on your business cards, envelopes, invoices, boxes, mouse pads, key chains, pens.