Today most conventional maintenance strategies are purely reactive, corrective (fixing or replacing equipment after it fails) or time -scheduled. These strategies are not well adapted to the control of the global performances of a manufacturing system. Therefore it is now necessary to move from traditional maintenance strategies to new ones like Opportunistic maintenance. Opportunistic maintenance works out to be the perfect remedy, which utilizes the opportunity of system shutdown or module dismantle to perform any maintenance required in the immediate future and saves a substantial amount of system down-time. This book presents an intelligent decision making method of how to decide whether a particular component requires opportunistic maintenance or not, and if so how cost effective this opportunity-based maintenance will be when compared to a probable future grounding. In this book we are discussing opportunistic maintenance as an alternate strategy for maintenance along with steps for implementing it then finally looking at the challenges posed for doing opportunity maintenance. This book is very helpful for research scholars & maintenance engineers.