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Dr.Zainab Saadi.Fourth Class Software Reliability 1 Effect of Component Reliability in Series Systems: In a series configuration, the component with the least reliability has the biggest effect on the system's reliability.

Dr.Zainab Saadi. Fourth Class
Software Reliability
1
Effect of Component Reliability in Series Systems:
In a series configuration, the component with the least
reliability has the biggest effect on the system's reliability. There is
a saying that "a chain is only as strong as its weakest link. " In a
chain, all the rings are in series and if any of the rings break, the
system fails. In addition, the weakest link in the chain is the one
that will break first, The weakest link dictates the strength of the
chain in the same way that the weakest component/subsystem
dictates the reliability of a series system. As a result, the reliability of a series system is always less
than the reliability of the least reliable component. Example
Consider three components arranged reliability-wise in series, where,R1 = 70%, R2 = 80% and R3 = 90% (for a given time). In Table (1), we can examine the effect of each component's
reliability on the overall system reliability.
The first row of the table shows the given reliability for each
component and the corresponding system reliability for these
values. In the second row, the reliability of Component 1 is
increased by a value of 10% while keeping the reliabilities of the
other two components constant. Similarly, by increasing the
reliabilities of Components 2 and 3 in rows 3 and 4 by a value of