According to the principles of project management, once a project has met its agreed-upon product requirements and is at the closure phase, the project manager should adhere to the project closure criteria. This involves ensuring that all project work has been completed, all project management processes have been executed, and there is formal recognition of the completion of the project1. Adding additional functionality after the project closure criteria have been met is not recommended as it can lead to scope creep and may affect the project's success2. The project manager should instead focus on finalizing all project documentation, releasing project resources, and ensuring that lessons learned are documented for future reference3. References:
* Project closing - Project Management Institute1.
* Project Closure Phase: A Comprehensive Guide2.
* Post Mortem After Successful Project Closure3.