Metrics and models in software quality engineering. Naturally, the goal of any ecommerce business is to have a high conversion rate. This project is composed of a theoretical section about software quality and a case study where. The method used by ibm rochester is also to count source instructions including executable lines and data definitions but excluding comments and program prologues. It is a broad course that addresses all of the body of knowledge area of the csqe. Quality metrics for business process models padsweb. Inprocess quality metrics software quality metrics. Software metrics, measurement and analytical methods. Performance metrics give an overview of where time is spent in the system and enable comparisons of wait times across the system. Chapter 2 discusses the process of requirement engineering and requirements management followed by software requirements speci. Performance metrics are collected at the entry point to each server in the system. In this chapter we discuss several metrics in each of three groups of software quality metrics.
Chapter 4, software quality metrics overview, presents examples of quality metrics for the three categories of metrics associated 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. Product quality metrics software quality metrics overview. In ecommerce, conversion rate is the percentage of website visitors who actually make a purchase and become customers. Overview of impact of requirement metrics in software. In this section we have tried to compare a set of quality metrics in requirement. It defines ways to assess the effectiveness of how one approaches. In this chapter from his book on software quality engineering, stephen h.
Conversely, the quality factors of chapter 4 may be correlated with new software metrics. Software quality metrics overview metrics and models. Software quality metrics focus on the quality aspects of the product, process, and project. Mar 02, 2018 specialized chapter sections, examples, implementation tips, and topics for discussion.
Metrics and models in software quality engineering, 2nd. Quality of the software, different metrics look at different aspects of quality, but this aspect deals with the code. The implementation details are provided in section 4. These are more closely associated with process and product metrics than with project metrics. Software quality metrics are a subset of software metrics that focus on the quality aspects of the product, process, and project. The software artifacts concerned by metrics include analysis, and design models, as well as program code.
For software and physical products, the improvements are typically smaller but still substantial when you emphasize usability in the design process. Shewhart overview financial selection from design for trustworthy software. The report is organized so that new sqm can still be analyzed. Software quality metrics overview product metrics e. Software quality metrics can be divided further into endproduct quality metrics and inprocess quality metrics. Within the software development process, there are many metrics that are all related to each. Summary software quality metrics overview informit. Nov 08, 2017 this book introduces software quality assurance sqa and provides an overview of standards used to implement sqa.
Advantage of using these process are also discussed. Albert einstein price has no meaning without quality. In software project management, we are primarily concerned with productivity and quality metrics. 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 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. Software metrics are important for many reasons, including measuring software performance, planning work items, measuring productivity, and many other uses. In the activitybased approach, quality models are constructed based on. In the last sections we also describe the key metrics used by several major software developers and discuss software metrics data collection. In chapter 4 software metrics are introduced and di. Software metrics overview software metrics provide a quantitative vehicle for evaluating and managing quality factors and risks related to a given software product.
It is useful to drive quality improvement from the development teams point of view. Objectives of quality measurement classification of software quality metrics process metrics product metrics implementation of software quality metrics limitations of software metrics the. Conversely, the quality factors of chapter 4 may be correlated with new. To structure the ideas and provide a comprehensive framework several software quality models have been introduced. Cisco prime network analysis module user guide overview. The quality plan defines the most important quality attributes for the software and includes a definition of the quality assessment process. Sep 20, 2017 for the love of physics walter lewin may 16, 2011 duration. Without customers, theres no commerce online or offline. In the past, various software quality models and metrics have been proposed and developed by different authors to measure the software quality. Hd calls density metrics measured by the number of calls. Part of the problem lies with the process, rather than individual developers. Software quality metrics overview software metrics can be classified into three categories. Metrics can be used at early stages as leading quality indicators of the.
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. Metrics and models in software quality engineering second. Software quality metrics are associated with process and product metrics than. A report on the analysis of metrics and measures on. 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 subset of metrics that focus on quality software quality metrics can be divided into. Its fairly easy to calculate simply divide the total marketing expenses for a period by the number of customers acquired during that same period.
Software metric is a qualitative indicator of any software dimension whereas model specifies the relationship among these metrics. Chapter 23 product metrics for software overview this chapter describes the use of product metrics in the software quality assurance process. On the basis of these challenges, and current research trends in aggregation of software metrics, we distill requirements for software quality models. It defines ways to assess the effectiveness of how one approaches software quality across key industry sectors such as telecommunications, transport, defense, and aerospace. Part 4 of this book part 4 of this book looks into 2 key issues from metrology that are often. In the past, various software quality models and metrics have. Software engineers use product metrics to help them assess. Software quality management software quality goals and objectives what the industry experts say. Compendium of software quality standards and metrics. Applying ieee software engineering standards and the cmmcmmi processes and procedures together can help users. For example, the inprocess quality metrics of a project are both. Prime nam software provides network operations and engineering with user, command line, and application programming interfaces that you use for traffic analysis of applications, hosts, and. Product metrics describe the characteristics of the product such as size, complexity, design features, performance, and quality level.
Compendium of software quality standards and metrics version 1. Software quality metrics overview product quality metrics. On the basis of these challenges, and current research trends in aggregation of software metrics, we. Assume that we are to set the defect rate goal for releasetorelease improvement of one product. Quality in software, interaction, and value contains a collection of writings from various experts in the field of usability and user interface development. Hd success metrics the level of success in responding to hd calls. 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. Why does poor software quality continue to plague enterprises of all sizes in all industries. Chapter 4, software quality metrics overview, presents examples of quality metrics for the three categories of metrics associated with the software lifecycle. Customer acquisition cost is the amount of money it takes to create a conversion. Software quality metrics overview product quality metrics informit.
Sep 16, 2017 a software metric is a measure of software characteristics which are quantifiable or countable. Software metrics overviewsoftware metrics provide a quantitative vehicle for evaluating and managing quality factors and risks related to a given software product. The book is also supported by an instructors guide. The defect rate metrics measure code quality per unit. On average, this will more than double a websites desired quality metrics yielding an improvement score of 2. Inprocess quality metrics are less formally defined than endproduct metrics, and their practices vary greatly among software developers. This book introduces software quality assurance sqa and provides an overview of standards used to implement sqa. Currently, the compendium describes 37 software quality attributes factors, criteria, and 23 software quality metrics. Sqa components in the project life cycle 72 chapter 7. In this chapter we elaborate on the transfer and adaptation of quality metrics from. Metrics and models in software quality engineering guide books.
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 course is designed to help improve your job performance and the quality of your companys software products. It describes the metrics programs of several large software companies and discusses software engineering data collection. Software quality metrics can be further divided into three categories. A closely related work on software quality modeling is the socalled activitybased approach proposed by deissenboeck et al. 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. Identifying quality metrics enables businesses to measure and control processes designed to make highquality products. Jan 03, 2012 on average, this will more than double a websites desired quality metrics yielding an improvement score of 2. Size is the critical factor in determining cost, schedule, and effort. Tools, techniques, and methodology of developing robust software book.
Ppt quality metrics powerpoint presentation free to. Preproject software quality components 41 chapter 5. This chapter discusses software process metrics that are classified into four. Measuring whether the product meets customer expectations provides a high level of. For the love of physics walter lewin may 16, 2011 duration. Endproduct quality metrics inprocess quality metrics the essence of software quality engineering is. Review of software quality metrics for objectoriented methodology. Software metrics overview software engineering at rit.
Software quality metrics for object oriented systems. Metrics for sw quality 4 suggested quality measures usability an attempt to measure userfriendliness can be measured in terms of 4 characteristics. The time required to become moderately efficient in the use of the system. Chapter 11 assuring the quality of software maintenance components 254 11. It describes the metrics programs of several large software companies and discusses collection of software engineering data. The concepts of software metrics are well established, and many metrics relating to product quality have been developed and used. Basics of software quality engineering benefits of software quality benefits of software quality. Download citation software process quality metrics software quality. Data is collected periodically and forwarded to a central point for analysis, decision making, and historical storage. Software quality metrics overview from metrics and models in software quality engineering. The components of the software quality assurance system overview 40 part ii.
Chapter 3 introduces software process improvements. The physical andor intellectual skill required to learn the system 2. This chapter gives several examples for each category, summarizes the metrics programs at motorola, hewlettpackard, and ibm rochester, and. The second step is to identify the software quality metrics by decomposing each factor into subfactors and those further into the metrics. Good practice in software quality engineering, however, also needs.
Kan discusses several metrics in each of three groups of software quality metrics. They can be grouped into three categories in accordance with the software life cycle. Financial perspectives on trustworthy software the important thing is not to stop questioning. Hd calls severity metrics the severity of the hd issues raised. Additionally, we perform both a theoretical, and an. 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 and soft computing models for component based software. The multiple professional views of product quality may be very different from popular or nonspecialist views. 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. Each chapter includes a reallife mini case study, examples, a summary, selected.
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