## Reply: Cost Estimate - Order of Magnitude.

 Name E-mail Your e-mail address will never be displayed on the site. Subject Message [quote="Tarek Al-Fahham" post=2096]I am reading the email from PMP Formula Guide, about Cost Estimation methods. I am refering to this paragraph: For instance you have to be able to say that an estimate that has a range from \$75,000 - \$175,000 with a target price of \$100,000 is an Order of Magnitude estimate. Just to make sure I understand the logic here !! The above range, based on \$100,000 is -25% to +75%, so the closest matching range is -50% to +50%, and that is why it is Order of Magnitude Estimate (ROM) ? Appreciate your confirmation ? I think it will not be easy to find the matching range, and decide the related cost estimation method. Help ? Tarek.[/quote]

## Topic History of : Cost Estimate - Order of Magnitude.

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11 years 2 months ago #2096

Tarek Al-Fahham

I am reading the email from PMP Formula Guide, about Cost Estimation methods.

I am refering to this paragraph:

For instance you have to be able to say that an estimate that has a range from \$75,000 - \$175,000 with a target price of \$100,000 is an Order of Magnitude estimate.

Just to make sure I understand the logic here !!

The above range, based on \$100,000 is -25% to +75%, so the closest matching range is -50% to +50%, and that is why it is Order of Magnitude Estimate (ROM) ?