This YouTube video introduces the Drexler-Sibbet model of Team Performance:

The Seven Questions and Steps To High-Performing Teams

Research has shown that a group must progress through certain development stages to become a high-performing team. A leader is responsible for managing this process, but it is one that affects us all, no matter our role, and we can all assist in improving our teams. The Drexler-Sibbet model of Team Performance helps us as it identifies the questions that a team needs to work through to progress through each level of performance. In this model, there are seven questions and stages of progression.

For more information, follow the link to the full article:

The Drexler-Sibbet Model of Team Performance