Answer:
The Integration Management knowledge area brings all of the process groups together. A project manager has to integrate the work of everyone on the team through all of these major activities to keep the project on track:
1. Being authorized by the project charter to control the budget and assign resources
2. Planning all of the work that's going to happen throughout the project.
3. Directing the work once it gets started
4. Monitoring the way the work progresses and looking for potential problems
5. Looking out for changes, understanding their impacts, and making sure they don't derail the project
6. Closing out the project and making sure that there are no loose ends when it's over