People in teams often think they already know how to work together. But each person probably has a different style of working. In order to define the team culture, you need to establish process goals (how you will work) in addition to task goals (what you will work on). Address what it will feel like to work with the team: Will everyone share responsibilities or will someone assign tasks? Then think about what the relationships will look like, and what you want from them: Will they be social and personal or all business? Will they divide and conquer, or work side-by-side?
Finally, concentrate on what you value:Do we care about speed or accuracy? Risk-taking or compliance? Innovation or building on core strengths? It’s always good to spell out what you’re aiming for so the team’s culture doesn’t evolve by itself in a different direction.
Adapted from the HBR Guide to Leading Teams by Mary Shapiro.