One of the most valuable parts of any Project is the Review process.
As an interim process, it is the chance to stop, think and take stock. This action is what people refer to as ‘coming up for air’ or ‘walking up the hillside’ or the ‘helicopter view’. It doesn’t take long to ask questions like, “are we doing the right things?”, “are we making the expected progress?”, “are we in the right state or place to meet new opportunities?” or “are the stakeholders on board?”.
As a final process, it is the chance to look back and view everything in perspective. “What were the successes? What have we learned? What would we change next time?”

It’s A Bit Like Looking Through the Rear Window.
You will recall, as a child, looking through the rear window on a long car journey. You see things differently to the driver.
It’s usually clearer (no flies and bugs)and you can trace the tracks you’ve taken, What’s more you have lots of time to see the detail – things aren’t flying past at 60 mph and you don’t see others advice and warning signs which might derail you. When you’re looking forward, your eyes and ears are drawn to what’s happening next.
Looking back does not appear to be getting you anywhere; which is probably why only 20% of Project Managers do it…
BitILike
“Hindsight, usually looked down upon, is probably as valuable as foresight, since it does include a few facts.” Grace Paley

