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Note that in addition to adding, removing, and modifying application functionality, new development and enhancement projects may also include the development or delivery of conversion functionality required to convert data from one application or application version to another Although the size of this conversion functionality is included within the functional size of the new development or enhancement project, it is not included in the functional size of the impacted application for the simple reason that the conversion functionality in question is not part of the application s functionality
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This chapter has provided a practical introduction to software sizing using functional size measurement It has demonstrated how functional size measurement can be applied to both new development and enhancement projects Readers should refer to the counting practices manuals, or equivalent, for the particular functional sizing methodology that they plan to use
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the COSMIC Functional Size Measurement Method
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he idea of measuring a size of the functional user requirements (FUR) of a piece of software in terms of its functionality as opposed to its physical components was first put forward by Allan Albrecht of IBM in 1979 He proposed the method called Function Point Analysis, which has since evolved into the IFPUG method see 19 of this book Albrecht s clever piece of lateral thinking laid the foundations for the subject of functional size measurement (or FSM), and it is a great tribute to his original idea that his method is still widely used today (And if the IFPUG method gives satisfactory results for performance measurement and estimating, then there is little incentive to change) However, the COSMIC functional sizing method was developed by the Common Software Measurement International Consortium to offer an alternative to IFPUG The logic behind, and the reasons for, the development of the COSMIC method are explained on the web site: wwwcosmiconcom The COSMIC method has been accepted as an international standard (ISO/IEC 19761: 2003) and at this writing is proceeding through the ISO process to be aligned with version 30 of the COSMIC method The method is now used in major corporations and public sector organizations around the world for software project performance measurement and for estimating in all the domains for which it was designed
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Overview of the COSMIC Functional Size Measurement Method
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The COSMIC method defines the principles, rules, and a process for measuring a standard functional size of a piece of software Functional size is a measure of the amount of functionality provided by the software, completely independent of any technical or quality considerations
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The common characteristic of the types of software for which the COSMIC method was designed (business applications, real-time software, infrastructure software, and hybrids of these) is that they are dominated by functions that input data, store and retrieve data, and output data In common with the other FSM methods covered in this book, the COSMIC method is not designed to size software that is dominated by functions that manipulate data, as in typical scientific and engineering software Subject to the preceding, the method may be applied to measure the FUR of software: At any level of decomposition, for example, a whole piece of software or any of its components, subcomponents, and so on In any layer of a multilayer architecture At any point in the life cycle of the piece of software
The Principles for Measuring the COSMIC Functional Size of a Piece of Software
The COSMIC method measures a size as seen by the functional users of the piece of software to be measured, that is, the senders and/or intended recipients of the data that must enter or exit from the software, respectively Functional users may be humans or other pieces of software, or may be hardware devices that interact directly with the software being measured, as defined in the FUR Different sizes may result depending on the defined functional users, since the different types can see different functionality The method uses a model of software known as the COSMIC Generic Software Model (see Figure 20-1) This model is based on fundamental software engineering principles, namely: The FUR of a piece of software can be analyzed into unique functional processes, which consist of subprocesses A subprocess may be either a data movement or a data manipulation
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