PMBOK 4th edition page 150 is clear about what are parametric estimates, however the word metrics appears also in several materials regarding project management, this is a subtle question but for some reason I relate these 2 terms, however I would like to know if somebody understands the real difference between PARAMETRIC ESTIMATING AND METICS, I relate "metrics" more to the result of measurements and "parametric estimating" more to the process itself of calculating data with information given, I would very much appreciate if someone would like to comment on this. -I am only learning to take the PMP exam so pls excuse since surely engineers might think question is not worthwhile, I therefore apologize but formus are precisely to help each other so I thought I would give it a try. thank you very much for the attention you may give to my doubt.