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Software reliability testing is being used as a tool to help assess these software engineering technologies.

Reliability Testing Tutorial: What is, Methods, Tools, Example

To improve the performance of software product and software development process, a thorough assessment of reliability is required. Testing software reliability is important because it is of great use for software managers and practitioners. Software reliability testing includes feature testing, load testing, and regression testing. Feature testing checks the features provided by the software and is conducted in the following steps:.

The feature test is followed by the load test. This test is conducted to check the performance of the software under maximum work load.

Software Reliability

Any software performs better up to some amount of workload, after which the response time of the software starts degrading. For example, a web site can be tested to see how many simultaneous users it can support without performance degradation. This testing mainly helps for Databases and Application servers.

Load testing also requires software performance testing , which checks how well some software performs under workload. Regression testing is used to check if any new bugs have been introduced through previous bug fixes. Regression testing is conducted after every change or update in the software features. This testing is periodic, depending on the length and features of the software. Reliability testing is more costly compared to other types of testing. Thus while doing reliability testing, proper management and planning is required.

This plan includes testing process to be implemented, data about its environment, test schedule, test points etc. Studies during development and design of software help for improving the reliability of a product. Reliability testing is essentially performed to eliminate the failure mode of the software. Life testing of the product should always be done after the design part is finished or at least the complete design is finalized. The causes of failure are detected and actions are taken to reduce defects. Suppose T is total accumulated time for prototype.

This graph is called Duane Plot. One can get how much reliability can be gained after all other cycles of test and fix it. If the value of alpha in the equation is zero the reliability can not be improved as expected for given number of failure. For alpha greater than zero, cumulative time T increases.

Reliability Testing Tutorial: What is, Methods, Tools, Example

Project Management Metrics Researchers have realized that good management can result in the better products. A good management can achieve higher reliability by using better development process,risk management process,configuration management process, etc. Process Metrics The quality of the product is directly related to the process. The process metrics can be used to estimate, monitor and improve the reliability and quality of software. Fault and Failure Metrics Fault and Failure Metrics are mainly used to check whether the system is completely failure-free.

Software Reliability Engineering Training by TONEX

Both the types of faults found out during the testing process i. Software reliability is measured in terms of mean time between failures MTBF. Reliability increases when errors or bugs from the program are removed. Step 3 Improvement Improvement completely depends upon the problems occurred in the application or system, or else the characteristics of the software.

According to the complexity of the software module,the way of improvement will also differ. Two main constraints time and budget, which will limit the efforts are put into the software reliability improvement. Example Methods for Reliability Testing Testing for reliability is about exercising an application so that failures are discovered and removed before the system is deployed. Test-Retest Reliability To estimate test-retest reliability, a single group of examinees will perform testing process only a few days or weeks apart. The time should be short enough so that the examinees skills in the area can be assessed.

The relationship between the examinee's scores from two different administrations is estimated, through statistical correlation. This type of reliability demonstrates the extent to which a test is able to produce stable, consistent scores across time. Parallel Forms Reliability Many exams have multiple formats of question papers, this parallel forms of exam provide Security.

Parallel forms reliability is estimated by administrating both forms of the exam to the same group of examinees.

The examinees scores on the two test forms are correlated in order to determine how similarly the two test forms functions. This reliability estimate is a measure of how consistent examinees scores can be expected to across test forms. It is the reliability of this classification decision that is estimated in decision consistency reliability. Importance of Reliability Testing A thorough assessment of reliability is required to improve the performance of software product and process. Testing software reliability will help the software managers and practitioners to a great extent.

To check the reliability of the software via testing:- A large number of test cases should be executed for an extended period of time to find out how long the software will execute without failure. The test cases distribution should match the actual or planned operational profile of the software.


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The more often a function of the software is executed, the greater the percentage of test cases that should be allocated to that function or subset. More correctly, it is the soul of reliability engineering program. Furthermore, reliability tests are mainly designed to uncover particular failure modes and other problems during software testing. In Software Engineering, Reliability Testing can be categorized into three segments, Modeling Measurement Improvement Factors Influencing Software Reliability The number of faults presents in the software The way users operate the system.

There is need to focus on parameters consideration while estimating reliability. The reliability of a system may increase or decreases depending on the selection of different parameters used. Thus there is need to identify factors that heavily affecting the reliability of the system. In present days, reusability is mostly used in the various area of research. CBSE metrics may be used to assess those techniques which are more suitable for estimating system reliability.