IEEE 1517-2010 en Information Technology-System and Software Life Cycle Processes-Reuse Processes (IEEE Computer Society)《信息技术 软件寿命周期过程 再使用过程》.pdf
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1、g44g40g40g40g3g54g87g71g3g20g24g20g26g140g16g21g19g20g19g11g53g72g89g76g86g76g82g81g3g82g73g44g40g40g40g3g54g87g71g3g20g24g20g26g16g20g28g28g28g12g44g40g40g40g3g54g87g68g81g71g68g85g71g3g73g82g85g3g44g81g73g82g85g80g68g87g76g82g81g55g72g70g75g81g82g79g82g74g92g179g54g92g86g87g72g80g3g68g81g71g3g54g8
2、2g73g87g90g68g85g72g47g76g73g72g3g38g92g70g79g72g3g51g85g82g70g72g86g86g72g86g179g53g72g88g86g72g51g85g82g70g72g86g86g72g86g44g40g40g40g3g38g82g80g83g88g87g72g85g3g54g82g70g76g72g87g92g54g83g82g81g86g82g85g72g71g3g69g92g3g87g75g72g54g82g73g87g90g68g85g72g3g9g3g54g92g86g87g72g80g86g3g40g81g74g76g81g7
3、2g72g85g76g81g74g3g54g87g68g81g71g68g85g71g86g3g38g82g80g80g76g87g87g72g72g44g40g40g40g22g3g51g68g85g78g3g36g89g72g81g88g72g3g49g72g90g3g60g82g85g78g15g3g49g60g3g20g19g19g20g25g16g24g28g28g26g15g3g56g54g36g3g3g21g24g3g36g88g74g88g86g87g3g21g19g20g19g20g24g20g26g55g48IEEE Std 1517-2010 (Revision of I
4、EEE Std 1517-1999) Copyright 2010 IEEE. All rights reserved. IEEE Standard for Information TechnologySystem and Software Life Cycle ProcessesReuse Processes Sponsor Software +1 978 750 8400. Permission to photocopy portions of any individual standard for educational classroom use can also be obtaine
5、d through the Copyright Clearance Center. Introduction This introduction is not part of IEEE Std 1517-2010, IEEE Standard for Information Technologyg650System and Software Life Cycle Processesg650Reuse Processes. This standard replaces IEEE Std 1517-1999 B3.aThe revision of this standard is a step i
6、n the strategy of harmonizing IEEE software and systems engineering standards with those of ISO/IEC JTC 1/SC 7 in order to achieve a fully integrated suite of system and software life cycle processes and guidance for their application. This revision is closely integrated with IEEE Std 12207-2008.bTo
7、 that end, this revision does not define processes but instead adds tasks and outcomes to processes and activities defined in IEEE Std 12207-2008. Clause 3 has been modified in this revision to more closely hew to the definitions in Clause 4 of IEEE Std 12207-2008. Subclause 7.3 of IEEE Std 12207-20
8、08 encompasses many processes specified in IEEE Std 1517-1999, and so those processes have been removed from this revision. In order to couple more tightly with IEEE Std 122207-2008, the structure of this revision differs from that of IEEE Std 1517-1999. The clauses correspond with clauses of IEEE S
9、td 12207-2008. Clause 5 corresponds to Clause 6 of IEEE Std 12207-2008. Clause 6 corresponds to Clause 7 of IEEE Std 12207-2008. The objectives defined in Annex C of IEEE Std 1517-1999 have been integrated into the processes of Clause 5 and Clause 6 of this revision. They comprise the reuse-related
10、outcomes specified for the processes. Software reuse entails capitalizing on existing software and systems to create new products. An organization cannot benefit from reuse by simply creating and employing libraries of assets. Rather, successful reuse requires the integration of reuse-related activi
11、ties into the life cycle processes used to create the reuse assets associated with software and system development. Unless reuse is explicitly defined in software and system life cycle processes, an organization will not be able to repeatedly exploit reuse opportunities in multiple software projects
12、 or products. Systematic reuse is the practice of reuse according to a consistent, repeatable process. Practicing systematic reuse requires a focus on the use of engineering principles for all reuse assets involved in development. The major benefits that systematic reuse can deliver are as follows:
13、g127 Increase software productivity g127 Shorten software development and maintenance time g127 Reduce duplication of effort g127 Move personnel, tools, and methods more easily among projects g127 Reduce software development and maintenance costs g127 Produce higher quality software products g127 In
14、crease software and system dependability aThe numbers in brackets correspond to those of the bibliography in Annex A. bInformation on references can be found in Clause 2. iv Copyright 2010 IEEE. All rights reserved. g127 Improve software interoperability and reliability g127 Provide a competitive ad
15、vantage to an organization that practices reuse There are a variety of approaches to implement the concept of reuse, including systematic and ad hoc reuse. What distinguishes systematic reuse from other methods is the avoidance of multiple versions of otherwise common elements. For example, suppose
16、a reuse approach results in multiple instantiations of a common element. If the instantiations are modified by software developers, then the element is no longer common and can no longer be maintained as a single element. In the context of this standard, systematic reuse excludes such approaches. Th
17、e majority of software products can be built with reuse assetsitems, such as designs or test plans, that have been designed to be used in multiple contexts. Because reuse assets can apply to software products, implementations of software products, or systems, reuse assets present tremendous opportun
18、ity for software reuse. One major problem encountered by organizations attempting to practice reuse is that reuse is simply missing from their life cycle processes. To harness the benefits of reuse, an organization must incorporate reuse throughout its system and software processes. An organization
19、that creates systems and software first and considers reuse second may not fully benefit from reuse practices. This standard endeavors to address this problem by defining a common framework for reuse activities and by defining how to integrate the practice of reuse into traditional system and softwa
20、re life cycle processes. Reuse activities describe how software products are built with assets and how to build and manage these assets. The reuse framework presented in this standard covers both the life cycle of a system and the life cycle of a software product. IEEE Std 12207-2008 establishes a c
21、ommon framework for software and system life cycle processes. This standard provides additional life cycle activities and tasks that augment the practice of systematic reuse. In addition to supplementing the activities defined in IEEE Std 12207-2008, this standard defines outcomes and tasks applicab
22、le throughout the life cycle process. Thus, the use of this standard requires access to and understanding of IEEE Std 12207-2008. For organizations that already employ systematic reuse activities, this standard may be used to determine the conformity of those activities to this standard and as a bas
23、is for improvement of those activities where warranted. When establishing or improving systematic reuse activities, organizations are encouraged to assess the business case. Although systematic reuse fosters significant benefits such as those already described, certain costs and risks may prevent be
24、nefits of reuse from being fully realized. These factors include the following: g127 The degree to which reuse benefits are relevant to the organization. For example, a small organization, or an organization that has few resources allocated to developing and maintain software products, may not be in
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