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ISO/IEC 20968-2002 pdf free

ISO/IEC 20968-2002 pdf free.Software engineering – Mk II Function Point Analysis – Counting Practices Manual.
1.4 Albrecht/IFPUG Function Point Analysis
Allan Albrecht developed the original Function Point Analysis method. The design authority for the direct descendent of his approach is now the International Function Point Users Group (‘IFPUG). The briefest reference is made here to the relationship between the Mk II and the IFPUG FPA methods.
The two methods measure subtly but significantly different sizes of a software product (and therefore of the work-output of the processes of developing, maintaining and enhancing a software product).
In terms of the sizes produced, the major differences are that Mk II FPA, with its finer granularity, is a continuous measure whereas IFPUG limits component size once a threshold is reached and that the Mkll method aims to better reflect the internal processing complexity of business ‘data-rich’ systems. As the concepts on which the size measure is based are logical transactions and entities, in which software requirements and functional specifications are typically expressed, a Mkll Functional Size measure should be truly independent of the technology or methods used to develop or implement the software.
The weightings introduced by Charles Symons were desned to deliver a size scale of similar magnitude for the Mkll method as for the IFPUG method. On average therefore, the methods give roughly the same software sizes up to around 400 function points (though there can be quite a scatter about the average for individual items of software). For larger sizes. Mk II FPA tends to produce increasingly higher sizes than the Albrecht/IFPUG method.
For some purposes, e.g. portfolio management, the methods may be regarded as equivalent. However, for the commonest purposes of performance measurement and estimating it is preferable to use one scale or the other consistently, only converting between them if needed, using a formula which shows the average relationship.
1.5 Applicability of Mk II FPA
Mkll FPA is a method that assists in measuring process efficiency and managing costs for application software development, enhancement or maintenance activities. It measures a software product size independent of technical characteristics of the software, in terms relevant to users. It can be:
• applied early in the software development process
• applied uniformly throughout the software’s lifetime
• interpreted in business terms, and
• understood by users of the software.
Mkll Function Points can be used to measure the functional size of any software application that can be described in terms of logical transactions, each comprising an input, process and output component. The sizing rules were designed to apply to application software from the domain of business information systems, where the processing component of each transaction tends to be dominated by considerations of the storage or retneval of data. The method may be applicable to software from other domains, but the user should note that the sizing rules do not take into account contributions to size such as from complex algorithms as typically found in scientific and engineering software, nor do the rules specifically take into account real-time requirements. To apply MklI FPA to these other domains may be possible or may require extensions to or new interpretations of the rules given in this manual. MkII FPA can be used for sizing:
●a requirements specification or functional specification of a new application or of a change to an existing application
●the requirements met by an existing, operational application,whether it be a bespoke application or an implementation of a packaged business software solution, and whether a batch or on- line implementation.ISO/IEC 20968 pdf download.

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