Chapter 20 Slide 5 Reuse practice Application system reuse Widespread. are copied and adapted to fit new requirements. Software reuse has, however, failed to become a standard software engineering practice. See our User Agreement and Privacy Policy. However, proper documentation is a necessity for the systematic reuse of components. The concluding chapter summarizes the subject matter and provides concluding remarks on the limits of component reuse and its prospects. However, systems and models are emerging to support that notion. Ch18 service oriented software engineering, No public clipboards found for this slide. 1. The principles of Re-Engineering when applied to the software development process is called software re-engineering. The code was written in Pascal and SPL. The STG develops applications for plotters and printers. Looks like youve clipped this slide to already. 5.1 MOTIVATION: TOWARDS REQUIREMENTS REUSE IN PRACTICE. Reuse-based software engineering is a software engineering strategy where the development process is geared to reusing existing software. ambiguity, incompleteness and inconsistency [Swi13], especially when natural language is used. Lets have some points on this topic: To a great extent, existing software documents (source code, design documents, etc.) The software units that are reused may be of radically different sizes: Application system reuseThe whole of an application system Used of Software Reverse Engineering Software Reverse Engineering is used in software design, reverse engineering enables the developer or programmer to add new features to the existing software with or without knowing the source code. Software reuse is the process of creating software systems from existing software rather than building them from scratch. Software Re-Engineering is the examination and alteration of a system to reconstitute it in a new form. Nowadays, the term component is used as a synonym for object most of the time, but it also stands for module or function. Discovering unexpected flaws or faults. It is usually said as Reuse based software engineering. In the first part of the book we give a comprehensive overview of the subject, describing benefits and obstacles to software reuse as well as various aspects like reuse techniques and reuse products. Software reuse In most engineering disciplines, systems are designed by composing existing components that have been used in other systems. It affects positively at software cost, quality, service to the customer and speed of delivery. Even though software reuse has been practiced in one form or another over many years, it is still an emerging discipline. Selection of the right kind of components having potential for reuse is important. However, some problems have been reported in the writing of SRS, e.g. There is more to software components than functions and classes. Software developed and used repeatedly by the same people on the same project, Product maintenance and new product versions, use of operating systems, database management systems, and other system tools doesnt amount to reuse. The article identifies key areas where model-based systems engineering provides benefits in reuse cases: requirements reuse, system context analysis as well as interface compatibility checking. Ian Sommerville 2004 Software Engineering, 7th edition. 374-401. Application system reuse The whole of an application system may be reused either by incorporating it without change into other systems (COTS reuse) or by developing application families. 2nd case study-Overview The study was done in the San Diego Technical Graphics Division of HP. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. .. 36 Table 6. Develop software with fewer people. What something is exactly, or has to be for effective software development, remains yet to be seen. The book Software Engineering with Reusable Components is intended for readers at universities as well as in industry. Ian Sommerville 1995 Software Engineering, 5th edition. The introductory chapter introduces the notions of software reuse and software component. Its attempting to reuse an existing design or code (probably also tested) thats similar to whats required. Although the initial requirements specification phase and the validation phase are comparable with other software processes, the intermediate phases in a reuse-oriented process are different. Part III: Software Engineering 1. It appears in many difierent forms from ad-hoc reuse to systematic reuse, and from white-box reuse to black-box reuse. Software reuse is still an emerging discipline. lhis simple yet powerful vision was introduced in 1968. Requirements specification 2. The software community does not yet agree on what a software component is exactly. Raybiztech Provides Legacy Application Re-Engineering Services, Software reengineering, Legacy Systems, its Application re-engineering and Integration services is well equipped to provide the much-needed IT support to its valued customers to achieve their business goals. Nontechnical aspects like legal, economic, measurement and organizational issues are covered as well. "This book is much more than just a very through compendium of reuse research. Clipping is a handy way to collect important slides you want to go back to later. Shorten software development time. To build a reusable component, reusable elements in the application system are firstly extracted. These four parts are complemented by an introductory and a concluding chapter. Domain analysis is a promising technique which can be used to create reusable components. SOFTWARE REUSE Software reuse is the use of existing software or software knowledge to build new software for an individual or an organization. Effective reuse of software products is reportedly increasing productivity, saving time, and reducing cost of software development. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Software reuse is the process ofcreating software systems from existing software rather than building software systems from scratch. Code 4. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. A) Application System Reuse B) Generator Based Reuse C) Domain Oriented Reuse Move personnel more easily from project to project. Software process models were developed to provide guidance in the creation of high-quality software systems by teams at predictable costs. Software is rarely built completely from scratch. Software engineering covers activities that are necessary to develop a software system. This part of the book gives the reader an introduction to software en- gineering and software process models. Software reuse introduces new activities, like domain analysis, and changes existing ones, e.g., design activities. We cover the part of the documentation that is affected by the reuse of software components, i.e., system documentation. Software reuse can cut software development time and costs. DOI: 10.1007/978-3-662-03345-6. This paper investigates PowerBuilder based technology of software reuse, especially the technology of component design. You can change your ad preferences anytime. Applications should be built by assembling components. The book Software Engineering with Reusable Components is divided into four main parts. Software life cycles have been influenced by many new developments that resulted in modified models like the risk-based spiral model. Systematic software reuse and the reuse of components influence almost the whole software engineering process (independent of what a component is). This part of the book gives the reader an overview of software components, the difierent kinds of components and their compositions, a taxonomy for components and compositions, and examples of successful component reuse. Reuse-based software engineering is an approach to development that tries to maximize the reuse of existing software. Component creation- For component creation, the reusable components have to be first identified. The priority of documentation in software projects has traditionally been low. In taking the reader through this Recently the term component-based or component-oriented software development has become popular. Knowledge There has been a major switch to reuse-based A special case of software reuse is . Software reuse is the process of creating software systems from existing software rather than building them from scratch. These phases are: 1. Developing with reuse and developing for reuse are the new challenges as compared to developing systems from scratch to meet certain requirements. With increasing reuse of software, new models for software engineering are emerging. Source code is most commonly reused; thus many people misconceive software reuse as the reuse of source code alone. However, the important items that can be effectively used again are, 1. Software reuse is also called as Code Reuse. Software engineering has been more focused on original development but it is now recognised that to achieve better software, more quickly and at lower cost, we need a design process that is based on systematic software reuse. Part I: Software Reuse The Application of Reusable Software Components Project of the Software Engineering Institute is developing a reuse-based software development methodology, and the current direction and the progress of the methodology work are discussed in this paper. What are stages of reuse-oriented software engineering? It further outlines an overall approach regarding tools and development processes. Chapter 15 Software Reuse Wing Lam, in Object-Oriented Technology and Computing Systems Re-engineering, 1999. This classification goes beyond source code components and also covers aspects from the area of distributed computing and emphasizes the importance of open systems and standards. This set of Software Engineering Multiple Choice Questions & Answers (MCQs) focuses on Software Reuse. Institut fr Wirtschaftsinformatik Software Engineering, J. Sametinger: Software Engineering with Reusable Components (Habilitationsschrift), Springer-Verlag, ISBN 3-540-62695-6, 1997. In the following synopsis we briefly sketch the contents of the four main parts. Test cases 5. where a whole application system is reused by implementing it across a range of different computers and operating systems. Chapters on domain engineering, component engineering and application engineering depict consequences of and influences from the systematic reuse of software components. Software components provide a vehicle for planned and systematic reuse. Systematic software reuse is a promising means to reduce development cycle time and cost, improve software quality, and leverage existing effort by constructing and applying multi-use assets like architectures, patterns, components, and frameworks. Yet we are far from the goal of making reuse the standard approach to software development. If you continue browsing the site, you agree to the use of cookies on this website. However, this part also contains information about other forms of reuse and distinguishes them. In this context components are defined as objects plus something. If we continue to neglect documentation we will not be able to increase productivity through the reuse of components. Any readers who are interested in software reuse in general and in component reuse and component-oriented software engineering in particular will find useful information in this book. RSEB is based on Jacobson's OO Software Engineering and OO Business Engineering, applied to an organization engaged in building sets of related applications from sets of reusable components. Design 3. Improve software system interoperability. Like software reuse, software components go beyond source code. COTS reuse is becoming increasingly common Component reuse Now seen as the key to effective and widespread reuse through component-based software engineering. 4 Generic application architectures application systems also tend to have a common architecture that reflects the application.! 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