Understanding How To Empower Your Manager To Get The Rating You Want
Come calibration time (i.e. when managers and very senior engineers come together to calculate your manager), your manager is going to have to defend you to get the rating they're proposing for you.
This is another reason why it's so important to have a clear expectations plan. By setting the baseline, your manager has a concrete anchoring point to argue your case, in particular when you have gone above and beyond the baseline.