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The expected accuracy level of estimates during the initiation phase of project should be: A-25% to +75% B-10% to +25% C-35%to +75% D-10%to +10%

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Question added by Mohamed El Sayed , Project Manager , Saudi Post
Date Posted: 2014/01/25
Bandar Aleid
by Bandar Aleid , Program Manager (PMP Certified) , Rheinmetall Arabia Simulation and Training

I think you are refering to Rough Order of Magnitude (ROM). It is usually -50% to +50% and sometimes can be -25% to75%. As the project enters the planning phase the percentage decreases to -10% to +10%