This activity is part of the Closing section, when we're done with the project, or we want to cancel it. In both cases, we need to do a few final things.
You shouldn’t forget the project after it’s finished. Normally, it’s the responsibility of the program or portfolio management system to take care of the Post-Project activities. If you have such a system, you’ll hand over the Business Case to them, and ignore the Post-Project Activities. Otherwise, the Sponsor remains responsible for the Post-Project activities for 2 to 5 years, depending on the project.