In any software industry , system quality plays an
important role . It comprises of hardware quality and software quality. We know
that hardware quality is constantly high .So
if the system quality changes , it is because of the variation in
software quality only. Software quality can be measured in many ways.
Reliability is an user – oriented measure of “software quality”.
Suppose assume that there are 3 programs that are
executing to solve a problem. By finding
the reliability of each program we can find which program has less reliability
and we can put more effort to modify that program to improve the overall
reliability of the system. So always there is a need to measure the
reliability. In the later sections we will discuss about how to improve reliability and quality of the
software 
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