Take a look at CMMI for PMO. Notice on the Technology row that to accomplish CMMI levels 4 and 5 you must have a PPM tool suite like P3M Engine.
Informational
All documents and information can be accessed from a convenient, context-relevant location, no matter where they are stored. Thorough integration provides context-relevance and supports the practice of writing once and retrieving multiple times from multiple contexts.
Tactical
Let P3M Engine do work for you. Any work P3M Engine does will go faster and be less prone to error than doing the same work manually. P3M Engine will automate processes and enhance information by bringing together data from multiple places into a context-relevant presentation.
Notifications
Receive notifications when assigned something new such as risks, issues, action items, decisions, reviews, and approvals.
Personal Task Lists
Your personal task list shows all your tasks. Links take you right to where you can manage that task.
Reports
Reports are automatically populated with risks, issues, decisions, change requests, deliverables, milestones, and dependencies.