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Note The ISBSG records the functional size in units of unadjusted FP
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and records the V as a separate and distinct project value AF While some organizations find value in using the adjusted FP count in their project work, the majority of the established estimating toolsets, including the ISBSG, report the functional size (unadjusted FP) separately from the non-functional measure (VAF)6
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The Logical Boundary
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One of the first steps to measuring functional size using any of the functional size measurement methods is to identify the logical boundary around the software application This boundary separates the software from the user domain (remember that users can be people, things, other software applications, departments, other organizations, and so on) As such, the software may span several
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At this writing, IFPUG has a working group working on a Software Non-functional Assessment Framework Project (SNAP) to provide a sizing method for nonfunctional requirements
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practical Software project estimation
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physical platforms and include both batch and online processes The software boundary is not drawn in terms of how the physical system is implemented, but rather in terms of how an experienced user would view the software This means that a single application boundary can encompass several hardware platforms (for example, mainframe and PC hardware used to provide an accounts receivable application would both be included within the single application boundary) ISO and IFPUG have identical definitions for (application) boundary (IFPUG, 2009; ISO, 2007): Boundary, a conceptual interface between the software under study and its users (IFPUG added the following note: Prior versions of this International Standard used the term application boundary )
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Where Does Functional Size Fit in with the ISBSG and Software Project Estimating
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After we have determined that the software project involves the new delivery or enhancement of functional user requirements (that is, functionality), we can measure the software s functional size If a project does not involve the delivery or enhancement of software functionality for example, it simply involves maintenance/fixes of already delivered functionality, or upgrades the technical or nonfunctional requirements, or is a pure documentation project, and so on then it cannot be sized using functional size measurement and must be estimated using some other estimation equations based on other input measures Once we have the functional size for a project or application (in functional size units), we have established the functional size of the project work product If we choose to evaluate the VAF, we then also have a numerical value for the influence of non-functional quality types of requirements for the application Just as the square meters (or feet) size of a house does not equal the speed at which a house can be built or its construction duration, the functional size does not equal delivery rate or work effort Functional size measures the size of what the software does, rather than how it is developed or implemented (technical requirements) or how it must operate (quality requirements) This means that given a common set of functional user requirements, the functional size of the software will be the same whether it is developed using COBOL or Java, or using rapid application development (RAD) or waterfall or agile development methods Functional size (and even IFPUG s optional VAF) provides us with objective software size measures for use in work-effort estimating equations (together with other factors) or to normalize productivity
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18:
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a B r i e f tu t o r i a l o n F u n c t i o n a l S i z e M e a s u r e m e n t
or quality ratios The value in using functional size lies in the ratios and normalized comparisons between ratios Process improvements can be found when normalized ratios are compared and their underlying project attributes assessed for their impact on the project
Note In 2008 IFPUG launched a project to address the measurement of
non-functional requirements within IS projects and applications The SNAP (Software Non-Functional Assessment Process) project will release an Assessment Practices Manual (APM) in 2010 to be reviewed and tested by the IFPUG membership The APM will enable the usage of the SNAP sizing method This will include the assessment itself, instructions on the completion of the assessment, and guidance on how to utilize and apply the results of the assessment In addition, common terms and definitions will be provided within the APM
Summary
Functional size measurement and functional size provide an objective, repeatable process for assessing the logical size of software based on its functional user requirements Functional size provides us with a standard, normalized measurement value of the work product Together with other measures, such as the value adjustment factor and project attributes, functional size based software metrics can highlight process improvement opportunities and are a proven approach to increasing the accuracy of software work-effort estimating precision and accuracy
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