The term "mission critical" applies to any activity, system, or equipment whose failure could result in serious consequences, such as loss of life, harm to the environment, or significant financial loss through production impact or plant damage. 

Written by Steve Mustard, a globally recognized expert in critical infrastructure operations, this book is an excellent reference and learning tool for students in entry-level programs and those beginning their careers in mission critical operations. It addresses the core principles of mission critical operations - click here for details