Features of Software Reliability Testing and what are reliability techniques.

Computer systems are an important part of our society. Reliability refers to the consistency of a measure. A test is considered reliable if we get the same result repeatedly. Software Reliability is the probability of failure-free software operation for a specified period of time in a specified environment. Software Reliability is also an important factor affecting system reliability.
A completely different approach is “reliability testing”, where the software is subjected to the same statistical distribution of inputs that is expected in operation.
Reliability testing will tend to uncover earlier those failures that are most likely in actual operation, thus directing efforts at fixing the most important faults.
The fault-finding effectiveness of reliability testing to deliver on its promise of better use of resources, it is necessary for the testing profile to be truly representative of operational use.
Reliability testing is attractive because it offers a basis for reliability assessment.
Reliability testing may be performed at several levels. Complex systems may be tested at component, circuit board, unit, assembly, subsystem and system levels.
A key aspect of reliability testing is to define "failure".

Software Reliability Techniques
- Trending reliability tracks the failure data produced by the software system to develop a reliability operational profile of the system over a specified time.
- Predictive reliability assigns probabilities to the operational profile of a software system.