277-280. -There are two broad use of measurement: assessment and prediction: ÷Predictive measurement of some attribute A relies on a mathematical model relating A to some existing measures of attributes A1, …, An. Change of the reusability code is not considered by these researchers.  M. Shaw, D. Garlan, "Software Architecture: PerspectivesDiscipline on an ٍEmerging Discipline”, Prentice Hall, 1996. Provide the maintainability requirements for the system and the allocation of the requirements to the subsystems. The goal of software testing metrics is to improve the efficiency and effectiveness in the software testing process and to help make better decisions for further testing process by providing reliable data about the testing process. An aggregated measure of software quality can be computed through a qualitative or a quantitative scoring scheme or a mix of both and then a weighting system reflecting the priorities. 1, pp. This technique allows software architects to analyse the maintainability of their sofrware architecture with respect to the optimal maintainability. Maintainability measures can be calculated and recorded at regular intervals, showing trends in maintainability, both positive and negative. (Chem.) 2.6.2 System Maintainability Describe the system for the purpose of maintainability. 1. Criteria-based assessment is a quantitative assessment of the software in terms of sustainability, maintainability, and usability. Shahmohammadii, G., Jalili, S. (2009). A Quantitative Evaluation of Maintainability of Software Architecture Styles.  P. Yu, T. Systa, and H. Muller, "Predicting FaultProneness using OO Metrics. Business decisions are rarely made with all the information or data we desire. Agile stories which are “done” in a certain time period – Counting the number of “stories,” or user requirements, which are actually shipped to the user, provides a more granular measure of the rate of delivery. Lafuente,"Graph-based Design and Analysis of Dynamic Software Architectures", LNCS 5065, pp. We review and adopt some metrics from conceptual modeling, software engineering and OO design for assessing maintainability of PyCATSHOO models. The discipline’s first concerns were electronic and mechanical components (Ebeling, 2010). ho often fails, and m uc h eac failure costs) rather than (someho w) t wice the same feature. The problem of maintaining software is We also describe the repository extraction tool that we built for this purpose.  P. Avgeriou P, and U. Zdun, "Architectural Patterns Revisited: A Pattern Language", Proc. For more critical decisions, quantitative risk analysis provides more objective information and data than the qualitative analysis. The maintainability of a software system is determined by properties of its source code. Code complexity can be specified and can be known by measurement, whereas time to repair can only be measured after the software is in support. Conf on Information Technology, 2005, pp.  N. Fenton, and A. Melton, "Deriving Structurally Based Software Measures", Journal of Systems and Software 12(3), pp.  L. Bass, P. Clements, and R. Kazman," Software Architecture in Practice", Addison-Wesley, 1998, p. 17. It was developed by Thomas J. McCabe, Sr. in 1976. Product operation factors− Correctness, Reliability, Efficiency, Integrity, Usability. The 11 factors are grouped into three categories – product operation, product revision, and product transition factors. One good measure of maintainability would be time required to fix a fault. Software metrics as means of quality analysis has attracted a lot of attention among researchers and practitioners in last one decade.  NE.  M. Alshayeb, and L. Wei, "An Empirical Validation of Object-Oriented Metrics in Two Different Iterative Software Processes," IEEE Trans on Software Engineering, Vol. A criteria-based assessment gives a measurement of quality in a number of areas. This measure of reliability is described most often using Cronbach’s alpha (sometimes called coefficient alpha). Reliability was first practiced in the early start-up days for the National Aeronautics and Space Administration (NASA) when Robert Lusser, working with Dr. Wernher von Braun's rocketry program, developed what is known as \"Lusser's Law\" . maintainability of a software architecture based on a spec- ified scenario profile. An important decision of design stage is the selection of a suitable software architecture style. SOFTWARE MAINTAINABILITY ASSESSMENT BASED ON COLLABORATIVE CMMI MODEL Haneen Al-Ahmad1, ... controlled using statistical and other quantitative techniques. 140 – 145.  F. Bachmann, L. Bass, M. Klein, M. and C. Shelton, “Designing Software Architectures to Achieve Quality Attribute Requirements”, IEE Proc. The Software Improvement Group (SIG) has developed a method to measure a software system's maintainability based on well-known code metrics. Workshop on Software and Performance, 1998. It measures how consistently participants respond to one set of items.  E. Weyuker, "The Evaluation of Software Complexity Measures", IEEE Trans on Soft.  L. Bass, P. Clements, and R. Kazman,"Software Architecture in Practice" (2nd Edition), Addison-Wesley, 2003, p. 89.
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