What measures may be implemented to reduce the amount of overhead caused by NPT?

Answer step-wise explaining detailly each step.

Explore the concept of "bath tub curve" in system reliability and its implications for maintenance strategies.

Describe static and path testing KPIs and project management savings.

If I were to ask you: a) when do you think users should be taught on a new system? b)Which phase of the system life cycle is the most creative and difficult to work in? b) Which step of the SDLC life cycle has the lowest cost of correcting errors?

Please provide two examples for each of the four categories of system maintenance.