Answer to Question #98892 in Software Engineering for Aliasgar Ansari

Question

The goal of verification and validation process is to establish that the software system is fit for the purpose. What the various factor on which level of required confidence required.

Answer 1

3-sigma rule can be used in this process. According to that rule, only about 2.1% of some values will lie outside of ±3σ interval with regard to the mean value. For instance, a software system was tested many times to measure how much time it can run without errors or interruptions. We have a set of data. We can calculate the mean and the standard deviation. Then we can be confident that 95.45% of runtime values lie within ±3σ interval. This data can be used to see whether the software complies with the requirements or not. However, the task can require other value of the required confidence level like σ or 2σ.