Definitive Estimates.

Hi,

As per PMZilla Formulae page Definitive Estimates is : -5% to + 10%, but as per Rita Mulchay its -10% to +15% (pg 204).

 

What correct?

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Good question.

 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.