Learn from experience
It’s too expensive to reinvent the wheel all the time, and that’s why we prefer to use the existing project management systems such as PRINCE2®, P3.express, and the PMBOK® Guide instead of building everything from scratch.
On a different level, inside projects, we can significantly benefit from the lessons learned in previous projects, especially those that were similar to the current one. We can do this when we have a proper way of documenting and sharing lessons.
Next: Defined roles and responsibilities