This document discusses how to avoid seven common mistakes when building and managing high-performing teams. It identifies the mistakes as: 1) failing to build support for the team with stakeholders, 2) failing to establish conditions for effectiveness, 3) failing to establish meaningful performance goals, 4) lacking a decision-making process, 5) failing to establish appropriate team norms, 6) having weak communication channels, and 7) being insensitive to diversity. It provides strategies to address each mistake, such as assessing team members, establishing clear goals and roles, encouraging participation in decision-making, and promoting open communication.