As per PMZilla Formulae page Definitive Estimates is : -5% to + 10%, but as per Rita Mulchay its -10% to +15% (pg 204).
Thu, 10/11/2007 - 16:41
The problem is PMBOK does not give the range for definitive estimates. So some books have -5% to +10% while some have other figures.
In exam, if you get this question, then most likely there will only be one of the two options.
Sun, 03/22/2020 - 17:44
The estimates that you have is near to the reality. It is simply one of the things that you can figure out for sure. - Marla Ahlgrimm
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