Explain Software Reliability, Models, Metrics and Types: Software Reliability can be defined as the probability of the failure-free software operation in a system under specific environment. It is a measure of how close the software system matches the prescribed specification. The software reliability is generally measured in terms of MTBF, i.e. Mean Time Between Failure. It is an important attribute of the software quality, serviceability, capability, documentation and functionality.

Due to the software complexity tends to be high, the software reliability is very hard to achieve. As the complexity of the software has an indirect relation with the software reliability, it also has a direct relation with many software quality factors such as capability and functionality.

Explain Software Reliability, Models, Metrics and Types

In this article, we will talk about Software reliability in Software Engineering, its models, metrics and types of reliability testing.

Software Reliability Models

There are two types of software reliability models named as the prediction models and estimation models.

Software Reliability Models
Software Reliability Models

Difference between software reliability estimation models and software prediction models

software reliability estimation models and software prediction models

Software Reliability Metrics

There are currently four categories of the metrics used to measure software reliability:

  • Project Management Metrics: A good management can result in the creation of the better products. According to researchers, there is a relation exists between the ability to complete within the desired quality objectives and development process. The higher reliability can be achieved by using better risk management process, configuration management process and development process.
  • Process Metrics: The process metrics can be used to estimate, improve and monitor the quality and reliability of the software. It is proved that the product’s quality is a direct function of the process.
  • Fault and Failure Metrics: The main motive of the Fault and Failure metrics is the ability to determine when the software is approaching the execution of failure-free. Both the number of faults found during the testing and after deliver can be analyzed and summarized to achieve this goal. The before delivery faults are those which found during testing, whereas the other ones are delivery faults reported after delivery.

Types of Reliability Testing

The testing of software reliability consists of feature testing, regression testing and load testing.

  1. Feature Testing: The feature testing is conducted in following steps:
  • Every operation of the software is executed once.
  • Reduction in the interaction between the two operations and then each operation are checked for the proper execution.
  1. Load Test: This test is performed after the feature test to check the software’s performance under maximum work load. This type of testing mainly assists in the application and database servers.
  2. Regression Test: Any bugs introduced through previous bug fixes are checked in the regression test. It is conducted after every change in the features of the software.

So it was all about Explain Software Reliability, Models, Metrics and Types. If you have any doubt in yur mind then please comment below.