A functional team must make the collective results of the group more important to each individual than individual members' goals.
Patrick LencioniThe impact of organizational health goes far beyond the walls of a company, extending to customers and vendors, even to spouses and children. It sends people to work in the morning with clarity, hope, and anticipation and brings them home at night with a greater sense of accomplishment, contribution, and self-esteem. The impact of this is as important as it is impossible to measure.
Patrick LencioniTeamwork remains a sustainable competitive advantage that has been largely untapped because it is hard to measure (teamwork impacts the outcome of an organization in such comprehensive and invasive ways that it's virtually impossible to isolate it as a single variable) and because it is extremely hard to achieve (it requires levels of courage and discipline that few executives possess) - ironically, building a strong team is very simple (it doesn't require masterful insights or tactics).
Patrick Lencioni