The ability of a product to perform specified functions under specified conditions and within specified time

Significance of reliability test:

1. Software failure may have disastrous consequences

2. The failure rate of software is relatively high in the whole computer system

3. Compared with hardware reliability technology, software reliability technology is very immature, which aggravates the importance of software reliability problem

4.In sharp contrast to the sharp decline in hardware costs, software costs are on the rise, and software reliability is one of the main reasons for this increase

5. Day by day the widespread application of computer technology, with the increasing of computer application software components in the system, and makes the system for software is more and more strong, the dependence of the software's influence on the activities of production and social life growing, thus increasing the software reliability problems in the field of software engineering and the importance in the field of computer engineering

The importance of software reliability problems also highlights the urgency of developing reliability testing technology for the purpose of discovering software reliability defects.