Kan discusses several metrics in each of three groups of software quality metrics. For the love of physics walter lewin may 16, 2011 duration. It is useful to drive quality improvement from the development teams point of view. These are more closely associated with process and product metrics than with project metrics. In the past, various software quality models and metrics have been proposed and developed by different authors to measure the software quality. Chapter 11 assuring the quality of software maintenance components 254 11.
Hd calls density metrics measured by the number of calls. In this section we have tried to compare a set of quality metrics in requirement. Summary software quality metrics overview informit. Software quality metrics overview product metrics e. Performance metrics give an overview of where time is spent in the system and enable comparisons of wait times across the system. Assume that we are to set the defect rate goal for releasetorelease improvement of one product. The multiple professional views of product quality may be very different from popular or nonspecialist views. They can be grouped into three categories in accordance with the software life cycle. Goal of the compendium of software quality standards and metrics is to provide an information resource connecting software quality standards with wellknown software metrics. Software quality model an overview sciencedirect topics. Software quality metrics overview product quality metrics. Moreover, we should view quality from the entire software lifecycle perspective and, in this regard, we should include metrics that measure the quality level of the maintenance process as another category of software quality metrics. The software artifacts concerned by metrics include analysis, and design models, as well as program code.
Metrics for sw quality 4 suggested quality measures usability an attempt to measure userfriendliness can be measured in terms of 4 characteristics. In ecommerce, conversion rate is the percentage of website visitors who actually make a purchase and become customers. It defines ways to assess the effectiveness of how one approaches. Within the software development process, there are many metrics that are all related to each. Chapter 4, software quality metrics overview, presents examples of quality metrics for the three categories of metrics associated with the software lifecycle. The defect rate metrics measure code quality per unit. The book is also supported by an instructors guide.
Preproject software quality components 41 chapter 5. Mar 02, 2018 specialized chapter sections, examples, implementation tips, and topics for discussion. Advantage of using these process are also discussed. In the last sections we also describe the key metrics used by several major software developers and discuss software metrics data collection. Sqa components in the project life cycle 72 chapter 7. Measuring whether the product meets customer expectations provides a high level of. On the basis of these challenges, and current research trends in aggregation of software metrics, we. The physical andor intellectual skill required to learn the system 2. Software quality metrics overview metrics and models. A report on the analysis of metrics and measures on software quality factors a literature study 1vanitha n, 2thirumalaiselvi r 1department of computer science, womens christian college. Software metrics overviewsoftware metrics provide a quantitative vehicle for evaluating and managing quality factors and risks related to a given software product. A report on the analysis of metrics and measures on. For example, a direct final metric for the factor reliability could be faults per 1,000 lines of code kloc with a target valuesay, one fault per 1,000 lines of code loc. In the past, various software quality models and metrics have.
Chapter 23 product metrics for software overview this chapter describes the use of product metrics in the software quality assurance process. The subset of metrics that focus on quality software quality metrics can be divided into. Metrics and models in software quality engineering, 2nd. To structure the ideas and provide a comprehensive framework several software quality models have been introduced.
Software quality metrics for object oriented systems. Software quality metrics overview from metrics and models in software quality engineering. Chapter 4, software quality metrics overview, presents examples of quality metrics for the three categories of metrics associated with the software life cycle. The quality plan defines the most important quality attributes for the software and includes a definition of the quality assessment process. Compendium of software quality standards and metrics.
Software metric is a qualitative indicator of any software dimension whereas model specifies the relationship among these metrics. Software metrics overview software metrics provide a quantitative vehicle for evaluating and managing quality factors and risks related to a given software product. Inprocess quality metrics software quality metrics. On average, this will more than double a websites desired quality metrics yielding an improvement score of 2. Jan 03, 2012 on average, this will more than double a websites desired quality metrics yielding an improvement score of 2. The implementation details are provided in section 4. Software quality metrics overview software metrics can be classified into three categories. Common objections to deployment automation metrics metrics overview chapter 9 standardize the development environment motivation how to apply the best practice controlling standards using gqm common objections to standardization metrics overview chapter 10 manage usage of thirdparty code. Objectives of quality measurement classification of software quality metrics process metrics product metrics implementation of software quality metrics limitations of software metrics the. Additionally, we perform both a theoretical, and an. Ppt quality metrics powerpoint presentation free to.
Compendium of software quality standards and metrics version 1. A closely related work on software quality modeling is the socalled activitybased approach proposed by deissenboeck et al. Metrics and models in software quality engineering. Quality in software, interaction, and value contains a collection of writings from various experts in the field of usability and user interface development. In this chapter an expansion and consolidation of the traditional software quality assurance sqa, software quality control sqc and software process improvement spi roles is proposed, in order to leverage a companys internal regulatory compliance resources for sqa, sqc, and spi activities, and vice versa. This project is composed of a theoretical section about software quality and a case study where. Software quality metrics are associated with process and product metrics than. Chapter 4 software process and project metrics overview software process and project metrics are quantitative measures that enable software engineers to gain insight into the efficiency of the software process and the projects conducted using the process framework. This chapter gives several examples for each category, summarizes the metrics programs at motorola, hewlettpackard, and ibm rochester, and.
Sep 16, 2017 a software metric is a measure of software characteristics which are quantifiable or countable. Sep 20, 2017 for the love of physics walter lewin may 16, 2011 duration. Conversely, the quality factors of chapter 4 may be correlated with new software metrics. In this chapter we elaborate on the transfer and adaptation of quality metrics from. Data is collected periodically and forwarded to a central point for analysis, decision making, and historical storage. Product quality metrics software quality metrics overview.
Hd calls severity metrics the severity of the hd issues raised. Basics of software quality engineering benefits of software quality benefits of software quality. For software and physical products, the improvements are typically smaller but still substantial when you emphasize usability in the design process. Customer acquisition cost is the amount of money it takes to create a conversion. Product metrics describe the characteristics of the product such selection from metrics and models in software quality engineering, second edition book. Metrics can be used at early stages as leading quality indicators of the. Software metrics, measurement and analytical methods. Software quality metrics can be further divided into three categories. The time required to become moderately efficient in the use of the system. In chapter 4 software metrics are introduced and di. The second step is to identify the software quality metrics by decomposing each factor into subfactors and those further into the metrics. Conversely, the quality factors of chapter 4 may be correlated with new. Part 4 of this book part 4 of this book looks into 2 key issues from metrology that are often.
It defines ways to assess the effectiveness of how one approaches software quality across key industry sectors such as telecommunications, transport, defense, and aerospace. Size is the critical factor in determining cost, schedule, and effort. In this chapter an expansion and consolidation of the traditional software quality assurance sqa, software quality control sqc and software process improvement spi roles is proposed, in order to. Applying ieee software engineering standards and the cmmcmmi processes and procedures together can help users. Software quality metrics overview semantic scholar. Metrics and models in software quality engineering guide books. Nov 08, 2017 this book introduces software quality assurance sqa and provides an overview of standards used to implement sqa. Chapter 3 introduces software process improvements. It describes the metrics programs of several large software companies and discusses software engineering data collection. Software quality metrics can be divided further into endproduct quality metrics and inprocess quality metrics. In the activitybased approach, quality models are constructed based on. Product metrics describe the characteristics of the product such as size, complexity, design features, performance, and quality level. A software quality model is a defined set of characteristics, and of relationships between them, which provides a framework for specifying quality requirements and evaluating quality isoiec 25000. The method used by ibm rochester is also to count source instructions including executable lines and data definitions but excluding comments and program prologues.
The satc applies a model for evaluating software quality that has four. Quality metrics for business process models padsweb. Hd success metrics the level of success in responding to hd calls. Software engineers use product metrics to help them assess. Part of the problem lies with the process, rather than individual developers. Performance metrics are collected at the entry point to each server in. Software metrics overview software engineering at rit. Software engineers use product metrics to help them assess the quality of the design and construction the software product being built.
In software project management, we are primarily concerned with productivity and quality metrics. Review of software quality metrics for objectoriented methodology. It describes the metrics programs of several large software companies and discusses collection of software engineering data. Its fairly easy to calculate simply divide the total marketing expenses for a period by the number of customers acquired during that same period. Cisco prime network analysis module user guide overview. Financial perspectives on trustworthy software the important thing is not to stop questioning. Identifying quality metrics enables businesses to measure and control processes designed to make highquality products. The report is organized so that new sqm can still be analyzed. In this chapter we discuss several metrics in each of three groups of software quality metrics. It is a broad course that addresses all of the body of knowledge area of the csqe. The components of the software quality assurance system overview 40 part ii. Specialized chapter sections, examples, implementation tips, and topics for discussion. The essence of software quality engineering is to investigate the relationships among inprocess metrics, project characteristics, and endproduct quality, and, based on the findings, to engineer improvements in both process and. Software metrics and soft computing models for component based software.
Software quality metrics focus on the quality aspects of the product, process, and project. Chapter 2 discusses the process of requirement engineering and requirements management followed by software requirements speci. Good practice in software quality engineering, however, also needs to consider the customers perspective. Because our goal is to understand the programming process and to learn to engineer quality into the process, inprocess quality metrics play an important role. Software quality metrics are a subset of software metrics that focus on the quality aspects of the product, process, and project. Naturally, the goal of any ecommerce business is to have a high conversion rate. Why does poor software quality continue to plague enterprises of all sizes in all industries. Tools, techniques, and methodology of developing robust software book. In this chapter from his book on software quality engineering, stephen h. Overview of impact of requirement metrics in software.
For example, the inprocess quality metrics of a project are both. This book introduces software quality assurance sqa and provides an overview of standards used to implement sqa. Inprocess quality metrics are less formally defined than endproduct metrics, and their practices vary greatly among software developers. It provides an understanding of how current research and practice has contributed towards improving quality issues in software, interaction and value. Performance metrics are collected at the entry point to each server in the system. Software metrics are important for many reasons, including measuring software performance, planning work items, measuring productivity, and many other uses. Software quality management software quality goals and objectives what the industry experts say. Software quality metrics overview product quality metrics informit. Without customers, theres no commerce online or offline. The concepts of software metrics are well established, and many metrics relating to product quality have been developed and used. Albert einstein price has no meaning without quality. Shewhart overview financial selection from design for trustworthy software.
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