It’s about communicating clearly!
Your team’s (or organisation, church, and even personal) mission gives clarity to your direction, informs your strategies and, together with your purpose, forms the basis of all your critical decisions.
The mission statement spells out your mission so that stakeholders (the team leader, team members, partners, target audience, customers, etc.) knows what you do. For yourself and your team, it serves as a reminder to help you stay on course. For others, it helps to differentiate you from other teams or organisations.
As I work with teams during the past 20 years, I often come across mission statements that are either so vague that they don’t tell me anything useful, or are so generic that they could just as well be the mission statement of another team!
These vague or generic mission statements are practically useless.