Life should NOT be a trip to the grave with the intention of arriving safely in an cool and well preserved body, but rather to skid in, chocolate in one hand, beer in the other, body wrecked, totally worn out and screaming WOO HOO what a ride!
You can put all kinds of metrics and numbers to the project, but in my opinion, and most of time in managments' opinion, the success is;
Did the customer pay for it and use it?
Yes = success
No = failure
a little bit = some rework
Something that you say or do today will make a difference to someone else.
Make it a GOOD thing!