According to this group development model, a group addresses three issues: interpersonal issues,task issues, and authority issues. The interpersonal issues include matters of trust, personal comfort, and security. The task issues include the mission or purpose of the group, the methods the group employs, and the outcomes expected of the group. The authority issuse include decisions about who is in charge, how power and influence are managed, and who has the right to tell whom to do what. This section addresses group formation, each stage of group development, and the characteristics of a mature group.