bytescout barcode reader sdk for .net the COSMIC Functional Size Measurement Method in Software

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the COSMIC Functional Size Measurement Method
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Functional User Requirements Software Functional processes
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Subprocesses Data movement Data manipulation
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Figure 20-1
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The COSMIC Generic Software Model
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Each functional process is triggered by an Entry data movement from a functional user that informs the functional process that the functional user has identified an event to which the software must respond A functional process is complete when it has done all that is required to respond to the event A data movement moves a single data group of attributes describing a single object of interest, where the latter is a thing of interest to a functional user There are four types of data movement subprocesses An Entry moves a data group into the software from a functional user, and an Exit moves a data group out Writes and Reads move a data group to and from persistent storage, respectively As an approximation for measurement purposes (and given the applicability of the method, described earlier), data manipulation subprocesses are not separately measured The method assumes that data manipulation is accounted for by the data movement that it is associated with The size of a piece of software is then defined as the total number of data movements (entries, exits, reads, and writes) summed over all functional processes of the piece of software Each data movement is counted as one COSMIC function point (CFP) The size of a functional process, and hence the size of a piece of software, can be a minimum of 2 CFP, with no upper limit This is a very important factor Most functional processes typically have a few data movements, say in the range of 2 10 CFP But sometimes software has some much larger (more
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complex ) functional processes; examples have been measured of up to 70 CFP in a banking business application and over 100 CFP for a single functional process in the avionics of a military aircraft The size of changes or enhancements required for existing software can also be measured The size of a change to a piece of software is the sum of all the data movements that must be added, changed, or deleted, where changed also includes changes to the data manipulation associated with the movement
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The Process for Measuring the COSMIC Functional Size of a Piece of Software
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The COSMIC measurement process has three phases, as shown in Figure 20-2 In the Measurement Strategy phase, the purpose of the measurement must be defined and then, for each separate piece of software that must be measured, the following information is needed: The layer of the architecture where it resides Its scope (what functionality is included) Its functional users Its level of decomposition (care must be taken in summing sizes of pieces of software at different levels of composition) In the Mapping Phase, the artifacts of the FUR of the software to be developed/enhanced and measured are analyzed to determine: The separate events that trigger functional processes The functional processes The objects of interest to the functional users, the data groups describing those objects of interest that will be moved, and the data movements
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Goals Software Context Model Measurement Strategy Purpose of the measurement Scope of each piece of software to be measured FUR in the form of the Generic Software Model Functional size of the software in units of CFP
Functional user requirements (FUR) in the artifacts of the software to be measured Generic Software Model
Mapping Phase
Measurement Phase The Measurement Process
Figure 20-2
COSMIC measurement process phases
20:
the COSMIC Functional Size Measurement Method
In the Measurement Phase, the functional processes are measured by counting the data movements and summing them appropriately to give the size of the pieces of software in units of CFP The measurement must be well documented for future use and interpretation
COSMIC Method Documentation
For the detailed measurement rules, see The COSMIC Functional Size Measurement Method v301: Measurement Manual, the COSMIC Implementation Guide for ISO/IEC 19761:2003 Three other important documents are in the v30 series: Method Overview - v30 (a more detailed overview of the method than is given here) Documentation Overview and Glossary of Terms - v301 Advanced and Related Topics - v30 Full documentation is available for free download from www cosmiconcom including translations in Arabic, Chinese, Dutch, French, Turkish, and Japanese A wide range of supporting services and tools is available for the COSMIC method, for example: The International Standard ISO/IEC 19761:2003, obtainable from wwwisoorg (updated in 2009 to align with v301 of the COSMIC method) A Method Overview document aimed at those who need an introduction to the method Specialist Guidelines, that supplement the Measurement Manual with guidance and many examples for various special types of software Guidelines exist for sizing business applications and data warehouses Other guidelines are in preparation, for example, for sizing components in an SOA architecture Guidance and formulae for converting sizes from firstgeneration methods Certification examinations Suppliers of consulting and training services, worldwide Case studies Estimating tools Benchmark data (in the ISBSG database and reports, from wwwisbsgorg)
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