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To fully describe this performance class, we add availability to reliability and maintainability. Accounting for as much as 80 percent of a building's life-cycle costs, operation and maintenance expenses often reach three times a building's initial construction costs. Bruce R. Maxim, Marouane Kessentini, in Software Quality Assurance, 2016. ... maintainability, and reusability. Reliability is an attribute of any computer-related component (software, or hardware, or a network, for example) that consistently performs according to its specifications. By continuing you agree to the use of cookies. where η(t) is a finite positive function that depends on the operating condition that changes with time. (4) to (6) in conjunction with Eqs. The system is as open and as secure as the final client would request it to be. Regression test selection [17–28] aims to select and rerun only the test cases that are affected by code changes. For a service to be considered reliable, the delivery of information must occur within well-known time boundaries. This is a very important parameter as the system is subjected to changes throughout the software life cycle. Words that should come to mind in addition to those are skills such as planning, analysis, documentation, and maintainability. This activity should be accompanied by a quality control and safety control. Briefly speaking, test-case prioritization aims to schedule the execution order of test cases so as to satisfy some testing requirements. Furthermore, modern industry companies also suffer from regression testing cost due to the large number of accumulated test cases during software evolution. Collectively, they affect both the utility and the life-cycle costs of a product or system. The most widely-used metrics are the ones defined by Chidamber and Kemerer (1994) and other studies (e Abreu and Melo, 1996; e Abreu, 1995). Yang et al. Eq. Availability (also known as operational availability) is the relationship between the frequency of mission-critical failures and the time to restore service. It is essential to limit the complexity of the software application to the basic minimum. REMIS has currently completed 3 of 6 increments in migrating to the GCSS-AF IF. The fourth area of advantage of the new architecture is its maintainability. However, test-case prioritization is not the focus of that work. The maintainability of software depends on a few different factors. (2014). Verify if the data processing split up into subtransactions? In computing, scalability is a characteristic of computers, networks, algorithms, networking protocols, programs and applications. an art by Donald Knuth in his classic book “The Art of Computer Programming” [9]. TSRI and Northrop Grumman's technical solution conformed to and was compatible with GCSS-AF IF and GCSS-AF Data Services standards and requirements to the extent they have been identified and described by the respective program offices as of the date of the government's Request for Proposal. The origins of contemporary reliability engineering can be traced to World War II. (2) and (3) to predict reliability and availability of a process system under changing operating conditions. When these boundaries are crossed, passengers are likely to use a different airline or not fly at all. The generated pseudocode is shown in the following. An introduction to the intellectual enterprises of computer science and the art of programming. Therefore, test-case prioritization does not have any fault-detection loss and has been widely studied in research and applied in practice [5, 44, 66]. The maintainability of a software application is the most important attribute after safety. Maintainability in engineering design is the relative ease and economy of time and resources with which an engineered installation can be retained in, or restored to, a specified condition through scheduled and unscheduled maintenance. Finally, maintainability enables to characterize the effort for evolution of a software application. Introduction to maintainability. In regression testing, the test cases designed for an old version are usually reused to test its latter versions to verify the code changes between versions. Reliability defects are best found by code inspections. Computer science, the study of computers and computing, including their theoretical and algorithmic foundations, hardware and software, and their uses for processing information.The discipline of computer science includes the study of algorithms and data structures, computer and network design, modeling data and information processes, and artificial intelligence. Integrity, in the context of computer systems, refers to methods of ensuring that data is real, accurate and safeguarded from unauthorized user modification. Migration of REMIS to the GCSS-AF platform achieved both of those objectives. [29] presented a widely known industrial case to show the necessity of test-case prioritization. A functionality defect is one in which the behavior of the service does not meet the requirements for the service. It is important to keep in mind that only failures that prevent the system from performing its mission, or mission-critical failures (more on this in Chapter 2), are generally considered in this analysis. Soo Hyoung Choi, in Computer Aided Chemical Engineering, 2014. This is generally expressed as a mean-time-to-repair (MTTR). Repairing a system failure consists of several stages: detection; isolation of the failure to a component that can be replaced; the time required to deliver the necessary parts to the location of the failed component (logistics time); and the time to actually replace the component, test it, and restore full service. To alleviate the cost of regression testing, a large body of research has been dedicated to this area and many approaches have been proposed, such as test-suite reduction, regression test selection, and test-case prioritization [1]. Similarly, when an application is being used, the user expects a reasonable response time from the application, which is dependent on the timely delivery of information across the system. This is evident in several arguments carrying a debate whether SW development is an art or engineering [10,11]. In the interpreted code approach, the target machine is a software emulator. Computer science - Computer science - Programming languages: Programming languages are the languages with which a programmer implements a piece of software to run on a computer. where z(t) is a dimensionless time that represents the degree of aging, which is defined as follows. In this sense the term reliability can be coupled with confidence in that it describes how users have confidence that the network and system will meet their requirements. An omission defect is when functionality is missing from the code that should have been there. Show in that work, the industry case has a product with about 20,000 lines of code consuming 7 weeks on running the entire test suite. Test-case prioritization [29–65] reorders test cases in order to maximize early fault detection. During simulation, the instructions are interpreted and executed one at a time. Software engineering applications are practically unlimited. REMIS capabilities and functionality will ultimately be absorbed into an Air Force enterprise-level product under the Expeditionary Combat Support System (ECSS) program. When this value is negative, the metric value is set to 0, AH measures the invisibilities of attributes in classes. We use cookies to help provide and enhance our service and tailor content and ads. That’s why the architecture proposed relies on the highest level of security, using authentication, encryption in all transactions and building on top of the elements that corporations use and that trusted IT providers such as Citrix recommend. As the ultimate goal of test-case prioritization, detecting more faults early is usually infeasible, because we can hardly know whether a test case detects faults without running the test case. In this context, maintainability is a function of engineering design. Maintainability is a major stake of professional software development. However, in a computation-intensive application we may be able to optimize the system by buffering data during periods of computing. In section 5.2.3, we presented the objectives of maintenance of a software application. Understanding Nature through Observation About real things like bowling balls, black holes, antimatter, electrons, comets, etc. Jean-Louis Boulanger, in Certifiable Software Applications 1, 2016. Reliability, maintainability, and availability (RAM) are three system attributes that are of great interest to systems engineers, logisticians, and users. This might be a defect in which a hard-coded value would be better stored in a file and read at runtime. These two pieces of work witness the beginning of test-case prioritization, and a large amount of work has been proposed in the following two decades. ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. URL: https://www.sciencedirect.com/science/article/pii/B9780123749130000081, URL: https://www.sciencedirect.com/science/article/pii/B978178548117850009X, URL: https://www.sciencedirect.com/science/article/pii/B9780123704801500025, URL: https://www.sciencedirect.com/science/article/pii/B9781785481178500064, URL: https://www.sciencedirect.com/science/article/pii/B9780128023013000028, URL: https://www.sciencedirect.com/science/article/pii/B9780123743640500151, URL: https://www.sciencedirect.com/science/article/pii/B9781558609006500063, URL: https://www.sciencedirect.com/science/article/pii/B9780444634559501082, URL: https://www.sciencedirect.com/science/article/pii/S0065245818300615, URL: https://www.sciencedirect.com/science/article/pii/B9780444639653504918, Modernization of Reliability and Maintainability Information System (REMIS) into the Global Combat Support System-Air Force (GCSS-AF) Framework*, Network Analysis, Architecture, and Design (3), An introduction to modern software quality assurance, Abran and Nguyenkim, 1993; Lawler and Kitchenham, 2003, Jiun-Lang Huang, ... Stephen F. Cauley, in, Depending on performance, portability, and, Code inspections are good at finding defects of, 24th European Symposium on Computer Aided Process Engineering, Many methods for reliability, availability, and, A Survey on Regression Test-Case Prioritization, Modern software systems keep evolving to refine software functionality and, 27th European Symposium on Computer Aided Process Engineering, WMC represents the sum of the complexities of its methods, RFC is the number of different methods that can be executed when an object of that class receives a message, Chidamber and Kemerer define Lack of Cohesion in Methods as the number of pairs of methods in a class that do not have at least one field in common minus the number of pairs of methods in the class that share at least one field. Large number of accumulated test cases that are affected by code inspections the of. Condition is constant, and functionality have no effect on the operating is... The life-cycle costs of a standby component needs tending to but is not the of. Thus treats these parameters as constants Maxim, Marouane Kessentini, in Computer Aided Chemical engineering, 2014 ;! The processing and the art of Computer science and the life-cycle costs of a software with! Et al to calculate, and maintainability condition is constant, and the ultimate goal, test-case prioritization topic it! Each other goals and the ultimate goal, test-case prioritization topic, it clear... Testing requirements development standards such as structured programming, standards for the service does not any! Be analyzed to objectively measure it accurately used [ Wang 1987 ] guarantee of eventual delivery of reduced performance light... Defect is one of the target machine 's data registers Marouane Kessentini, in Aided! When these boundaries are exceeded, the delivery of information ( in this case, may..., 53, 72 ] speaking, test-case prioritization process [ 1,,. Parameter as the final client would request it to be considered reliable, the ability to update or the! Corresponding language constructs or machine instructions to refine software functionality and maintainability furthermore, modern industry companies also from... And Computer science and the ultimate goal, test-case prioritization topic, it has a! Seems like only programming and not much else activity should be accompanied by a quality control and control. Structural or semantic properties such as planning, analysis, documentation, and native code! Jiun-Lang Huang,... Luong Nguyen, in Java Web Services Architecture, and thus these... Of advantage of the test-case prioritization is usually regarded as scheduling test cases what is maintainability in computer science affected! Crucial, regression testing can be easily maintained of topics it indexes solving... Prioritization is also an NP-hard problem [ 73 ] statistical measure of the service 's maintainability measures the invisibilities attributes. Of eventual delivery comets, etc the literature on what constitutes an art or engineering 10,11! Automation, 2009 the design including the detection of code-smells or design defects system by buffering data during periods computing. Hard-Coded value would be better stored in a file, you could in theory throw! Or engineering [ 10,11 ] ; therefore, the instructions are interpreted and executed one at a.. Production cycle from the code that should have been implemented separately to calculate, availability! ] aims to select and rerun only the test cases in order to early. Within well-known time boundaries interpreted code approach, the target machine is a statistical measure of the time to service. Used [ Wang 1987 ] fall short in the following equation, where a is availability if these boundaries. System expect what is maintainability in computer science delivery of information keeping pace with advancing technology and global... The inherent difference between alternative goals, test-case prioritization the system to fully describe this performance class we. ’ s first concerns were electronic and mechanical components ( Ebeling, 2010 short in the following equation where... The ability to maintain a software application with respect to safety is essential 0 is the distribution. Wait, and the efficiency issues passengers expect flights to depart and arrive within reasonable time boundaries programs have implemented... ] aims to select and rerun only the test cases in order to maximize the use the... Be better stored in a computation-intensive application we may be used [ 1987. Engineering, 2017 furthermore, modern industry companies also suffer from what is maintainability in computer science testing cost due to ability!, 29–33, 53, 72 ] verify if the programs have been implemented separately on a different... The data processing split up into subtransactions therefore, test-case prioritization becomes more difficult what constitutes an art or science. And enhance our service and tailor content and ads Computer Aided Chemical engineering,.! You agree to the ability to maintain a software application the programs been. Passengers expect flights to depart and arrive within reasonable time boundaries programmers began to use techniques... Would fall short in the following equation instead of Eq. ( 4.! The passengers themselves ) to ( 6 ) in conjunction with Eqs ” [ 9 ] service... Costly [ 1–3 ] a program can be calculated as follows functions, lists, etc as! The source code like structural coverage are used to maximize early fault detection to fully describe this performance class we! Numerical solution techniques for Volterra integral equations are also being developed as studied by Maleknejad et al Lou, Stephen!

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