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Most, if not all CFPS (Certified Function Point Specialists) have encountered projects that sit outside the organizational norm with significant development requirements for non-functional work.
Function points are, of course, focused on delivered functionality, not non-functional development. Therefore, SNAP (Software Non-functional Assessment Process) has been developed to supplement the FP sizing methodology and provide a sizing technique for the non-functional component. This report explains SNAP and how it can be used to measure non-functional requirements.
The report is available for download here: http://www.softwarevalue.com/insights/publications/ta-archives/how-to-measure-non-functional-requirements/
To access more Trusted Advisor articles, visit: http://www.softwarevalue.com/insights/publications/#trustedadvisor