Rough Order of Magnitude

Rough Order of Magnitude
the Rough Order of Magnitude estimate = -50% to +50%.


Rough Order-of-Magnitude (ROM) Estimate of costs and time when Requirements are not specified in the early stages of the project.

he ROM Estimate includes the following project parameters which are the foundation for estimation:
Parameter Explanation
Interval, staff-hours Project may be completed within this range if all Requirements will be within the scope specified by Vision document.
Accuracy, % ROM Estimate is created by three estimators. Accuracy equals to 100% minus the biggest difference between one individual estimate and the mean.
Time estimate, weeks Minimum and maximum duration of the project in weeks.
Retainer Amount of staff-hours required to complete Inception Phase in order to produce detailed Specification and exact project Budget.
KSLOC estimated An estimate of Kilo Software Lines Of Code to be written in the project. We calculate and estimate only hand-written, non-empty, non-comment lines of code.
Unadjusted FPs Function Points as an output parameter from COCOMO-II estimate method. In a simplified approach, function points could be compared with software functions or class methods.
Features, BC/WC/ML List of Features from Vision document that were used by estimators. Best Case (BC), Worst Case (WC), and Most Likely (ML) are the output numbers of three-point estimate method. The numbers are just programming staff-hours by the estimate of programmers.


http://www.technoparkcorp.com/process/cost/rom