Thursday, March 17, 2005
COCOMO Notes
COCOMO Notes
I have gotten a fair amount of interest lately in the Micro-COCOMO model available for download on this site, condensing many of the questions and feedback, I have the following advise.
If you have not COCOMO'd before you should read the book first. The co-efficients and scalars used in the micro-COCOMO spreadsheet are obtained by doing projects of varying size and using analysis of variance and his techniques to "fine tune" the constants used.
Comment: a first pass accuracy with the tool of +/- 10% is VERY GOOD.
Comment: This assumes a requirements doc + an ERD + a site map.
The current Micro-COCOMO is for ASP (classic). We are building a worksheet and co-efficients for ASP.NET and .NET rich client UIs but do not have enough data points yet. (If you have some, then share, please!)
Worksheet columns and what they mean
Pages/Reports are the number of ASP Pages or Reporting Tool Reports needed by the component you are estimating
Tables: SQL Server tables assuming proper 3rd normal form (this can be estimated from the ERD)
Controls: The number of individual controls used on the form/page
SP: SQL Stored Procedures (as estimated from the requirements)
Code: An estimate of the number of lines of code (outside of the other things) you estimate (using function point or some other estimating mechanism).
Comment: COCOMO is driven off of lines of code. This may sound daft, but assigning a scalar quantity to other things (like pages and reports) allows us to estimate using a worksheet that is more directly connected to the requirements, ERD and Wire frames.
I have gotten a fair amount of interest lately in the Micro-COCOMO model available for download on this site, condensing many of the questions and feedback, I have the following advise.
If you have not COCOMO'd before you should read the book first. The co-efficients and scalars used in the micro-COCOMO spreadsheet are obtained by doing projects of varying size and using analysis of variance and his techniques to "fine tune" the constants used.
Comment: a first pass accuracy with the tool of +/- 10% is VERY GOOD.
Comment: This assumes a requirements doc + an ERD + a site map.
The current Micro-COCOMO is for ASP (classic). We are building a worksheet and co-efficients for ASP.NET and .NET rich client UIs but do not have enough data points yet. (If you have some, then share, please!)
Worksheet columns and what they mean
Comment: COCOMO is driven off of lines of code. This may sound daft, but assigning a scalar quantity to other things (like pages and reports) allows us to estimate using a worksheet that is more directly connected to the requirements, ERD and Wire frames.
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