Kan is senior technical staff member stsm and a technical manager in programming for ibm in rochester, minnesota. Inprocess quality metrics are less formally defined than endproduct metrics, and their practices vary greatly among software developers. Product metrics describe the characteristics of the product such as size, complexity, design features, performance, and quality level. Metrics for implementing automated software testing. Software testing and quality assurance software quality metrics.
The models specify the various stages of the process and the order in which they are carried out. Sarialioglu states that without any metrics and measures, software testing becomes a meaningless and unreal activity. Measurement theory overview of software metrics, basics of measurement theory. Kan metrics and models in software quality engineering. Ppt software process models powerpoint presentation. It involves assessing the risk, based on the complexity, business criticality, usage frequency, visible areas, defect prone areas, etc. A free powerpoint ppt presentation displayed as a flash slide show on id. We can accurately measure some property of software or process. An external metric is a quantitative scale and measurement method, which can be used for measuring an attribute or characteristic of a software product, derived from the.
Ppt software test metrics powerpoint presentation free. Report on the metrics and standards for software testing. The basis of information flow metrics is found upon the following concept the simplest system consists of the component, and it is the work that these components do and how they are fitted together that identify the complexity of the system. Imagine, in any project, that you are not aware of the total effort you have expended and the total number of defects you have found. To develop effective software metrics, the following steps are used. It helps the project manager to further predict the effort and time which will be needed to build the project. Now customize the name of a clipboard to store your clips. Well now take a closer look at the various types of the two most important categories of metrics project metrics, and process metrics. It is basically, a subclass of software metrics that mainly emphasizes on quality assets of the software product, process and project. These assumptions determine the form of the model and the. Grady and caswell 1986 offer a good description of hewlettpackards software metric program, including both the primitive metrics and computed metrics that are widely used at hp.
This part provides external metrics for measuring software quality characteristics. The ideal example to understand metrics would be a weekly mileage of. Our primary goal with this work was to help program managers measure progress more effectively. Software metrics are measures of the success of a software process. An overview of object oriented design metrics 9 1 introduction it is widely accepted that object oriented development requires a different way of thinking than traditional structured development 1 and software projects are shifting to object oriented design. As the name suggest, loc count the total number of lines of source code. Metrics, for both process and software, tell us to what extent a desired characteristic is present in our processes or our software systems. The software development models are the various processes or methodologies that are being selected for the development of the project depending on the projects aims and goals. He also describes the key metrics used by several major software developers and discusses software metrics data collection. One of the major handicaps of waterfall stlc model was that defects were found at a very later stage of the development process since testing was done at the end of the development cycle.
Clipping is a handy way to collect important slides you want to go back to later. In software testing, metric is a quantitative measure of the degree to which. The textbook and the accompanying materials posted on this website are freely available for fair use. These data representation graphs are useful for various business analysis, research, and statistical reports. An effective software metrics helps software engineers to identify shortcomings in the software development life cycle so that the software can be developed as per the user requirements, within estimated schedule and cost, with required quality level, and so on. Software estimation, measurement, and metrics acqnotes. Important software test metrics and measurements explained with. Strategies of software testing tutorial to learn strategies of software testing in simple, easy and step by step way with syntax, examples and notes. A tcoe is a virtual command center that uses standardized testing methodology. Metrics and models in software quality engineering goes even further, discussing such topics as inprocess metrics, defect removal effectiveness, customer satisfaction, and more.
You cant control what you cant measure tom demacro an american software engineer, author, and consultant on software engineering topics. Software testing process metrics bug tracking tools enable the extraction of several useful metrics about the software and the testing process. They are different from just testing for errors because they. For example, a measure is the number of failures experienced during testing. Maintainability is a desired characteristic of a software component and is referenced in all the main software quality models including the iso 9126. Classification of software metrics in software engineering. In this chapter from his book on software quality engineering, stephen h.
A product metrics taxonomy metrics for the analysis model metrics for. The models make assumptions about the fault discovery and removal process. Metrics and models in software quality engineering, stephen h. Metrics help organization to obtain the information it needs to continue to improve its productivity, reduce errors and improve acceptance of processes, products. Vmodel of testing is criticized as being reliant on the timely availability of complete and accurate development documentation, derivation of tests from a single. For predicting, need a model of relationship of predicted variable. A software metric is a measure of software characteristics which are measurable or countable. Function point can be effectively used to estimate testing effort. Several daily, weekly, or annual progress reports in single slide view are known as dashboard templates. Software measurement is a titrate impute of a characteristic of a software product or the software process. A measurement is an manifestation of the size, quantity, amount or dimension of a particular attributes of a product or process. Software quality metrics are a subset of software metrics that focus on the quality aspects of the product, process, and project. Metrics and models in software quality engineering, 2nd.
A metric defines in quantitative terms the degree to which a system, system component, or process possesses a given attribute. Test managers can see if any trends in the data show areas that. But knowing what to measure and avoiding measurements that dont provide valuable insight are essential. Software metrics massachusetts institute of technology. Software metrics are similar to the four functions of management. A metric is a quantitative measure of the degree to which a system, system component, or process possesses a. These are more closely associated with process and product metrics than with project metrics. The ideal example to understand metrics would be a weekly mileage of a car compared to its ideal mileage recommended by the manufacturer. Simply, a metric is a unit used for describing an attribute.
Software reliability modelssoftware reliability models are statistical models which can be used to make predictions about a software systems failure rate, given the failure history of the system. Research topics to advance the state of the art in software testing, technology transfer approaches so that current practice benefits from the state of the art, and software testing metrics and measurements. Ppt software testing and quality assurance software quality. Before starting what is software test metrics and types, i would like to start with the famous quotes in terms of metrics. Kan discusses several metrics in each of three groups of software quality metrics. Permission to reproduce or copy all or parts of this material for nonprofit use is granted on the. This ppt covers the following topics software quality a framework for product. No way to measure property directly or final product does not yet exist for predicting, need a model of relationship of predicted variable with other measurable variables. Within the software development process, many metrics are that are all connected.
Software measurement and metrics software measurement. Software quality metrics can be further divided into three categories product quality metrics. Adapted from teknologika blog software development metrics defect tracking c. Kan, metrics and models in software quality engineering, 2nd ed. Software metric is a broader concept that incorporates software quality metrics in it, and mainly consists of three types of metrics. Inprocess quality metrics software quality metrics.
It involves prioritizing the testing of features, modules and functions of the application under test based on impact and likelihood of failures. The other set of metrics we would live to consider are known as information flow metrics. Software engineering project size estimation techniques. The main advantage of object oriented design is its modularity and reusability. Metrics and models in software quality engineering. Covers topics like introduction to testing, testing templates, difference between verification and validation, strategy of testing etc. Software measurement metrics software metrics is a standard of measure that. Primitive metrics are those that are directly measurable and accountable such as control token, data token, defect, total operands, loc, and so forth. As process manager of the quality management process in product development for ibms eserver iseries software development, his responsibilities include quality goal setting, supplier quality requirements, quality plans, inprocess metrics, field quality status, and. Software testing metric is be defined as a quantitative measure that helps to estimate the progress, quality, and health of a software testing effort. Software metrics are used to measure the quality of the project.
For agile software development, one of the most important metrics is delivered business value. Examples of metrics programs software quality metrics. Majority of the metrics used for testing focus on testing process rather than the technical characteristics of test. Project and process metrics in software engineering. Software engineering information flow metrics javatpoint. In theory, metrics can help to improve the development process and provide companies with information that makes future projects more predictable, efficient, etc. Generally, testers use metrics for analysis, design, and coding to guide them in design and execution of test cases. An effective qa strategy is a measured one finding the right qa metrics to measure product quality and team efficiency provide critical insights into your software testing process.
A testing center of excellence tcoe delivers proven results by helping companies optimize application quality and performance, improve alignment between business and it, increase qa efficiency and do more with their existing qa budgets, tools, environments and people. Estimation of the size of software is an essential part of software project management. An in depth look at research that has been done on software metrics. Various measures are used in project size estimation. Numerous reallife examples, many taken from the authors experience as the software quality focal point for ibms baldrige awardwinning as400, show you how to put. Metrics can be defined as standards of measurement. Risk based testing rbt is a testing type done based on the probability of risk. On the one hand, inprocess quality metrics simply means tracking defect arrival during formal machine testing for some organizations.
In the stlc process, each activity is carried out in a planned and systematic way. Software metrics provide quantitative approach to the development and validation of the software process models. What is software testing life cycle stlc software testing life cycle refers to a testing process which has specific steps to be executed in a definite sequence to ensure that the quality goals have been met. Jones, keynote address, fifth international conference on software quality, austin, tx, 1995. These metrics enable management to understand the quality of the software, the productivity of the development team, code complexity, customer satisfaction, agile process, and operational metrics. Software metrics is a standard of measure that contains many activities which involve some degree of measurement. Software metrics are valuable for many reasons, including measuring software performance, planning work items, measuring productivity, and many other uses.
Chapter 5 software process models problems with traditional processes focused on and oriented towards large projects and lengthy development time years. A metric is a quantitative measure of the degree to which a system, system component, or process possesses a given attribute. The modern metrics powerpoint dashboard provides several data drive charts and graphs. There are many development life cycle models that have been developed in order to achieve different required objectives. It includes size, design, complexity, performance and other parameters that are associated with the products quality. These progress measures, while observationbased, do not violate the team spirit.
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