Their response to these criticisms—articulated in the 1992 second edition—was pragmatic: “All models are wrong, but some are useful.” The solution is not absolute truth; it is a disciplined way to quantify uncertainty.

“If I push the emergency stop button, what’s the chance nothing happens?”

The book systematically covers:

While applicable to all engineering, their work is particularly synonymous with power system reliability, categorized into three hierarchical levels:

The authors categorize reliability evaluation into several critical analytical and simulation-based techniques: