Concept of layer of protection analysis - pioneered by Arthur Dowell III in early of 90s, has been applied in most sector of process and instrumentation engineering application. This methods also helpful for further study like Quantitative Risk Assessment, Safety Integrity Level Study, etc.

By applying the layer of protection base on this method, we can precisely install an equipment without worrying about it's integrity - the basic problem for all process safety engineer. This book also give you an answer on "HOW SAFETY IS SAFE?"