What is the ROM?

Submitted by pmhelpme on Thu, 05/12/2011 - 19:52

 


I am confused as some books say it is +/-50% others say it is -25/+100. Does anyone have a definitive answer?


 


 

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deepakadlakha

Thu, 05/12/2011 - 21:37

I will trust PMBOK guide and remember that.

Akshay Singh

Wed, 06/22/2011 - 10:36



Cost estimate is an iterative process. ROM (rough order of magnitude) is in range of +/- 50 % in initiation phase ( at start of project).This means estimate is very rough.

However when details are provided during project execution then this ROM could narrow down to +/- 10%.This means estimate is getting corrected and going towards actual.

If no information is provided on project phase then it is taken as +/- 50%.

Regards

Akshay Singh
akshay@emensuslearning.com
www.emensuslearning.com

Frances Tessler

Sat, 09/20/2014 - 17:34

It is rough order of magnitude estimate and is -25% to +75% accuracy for the exam.