The PMBOK Guide does not have a termination phase -- it is referred to as closing. Like the initiation phase, it is small in that it contains a limited number of activities which may be augmented by local policies and procedures. During the closing phase of a project:
- The final, accepted and verified project deliverables are transitioned to the client.
- Administrative closure takes place (bills paid, revenues received, historical documents updated and retained, final project audits conducted, etc.). The PMBOK Guide refers to this as the update of organizational process assets and only specifies the project plan (and related documents and worksheets) and closure guidelines (which should cover all the other items I've listed and more).