Maintainability is of crucial importance throughout industry and is established as one of the most important issues in the aerospace and defence arena. No new system can be introduced without full maintainability, analysis and demonstration; a type of analysis which reduces life cycle costs by decreasing operational and maintenance costs and increasing systems operational effectiveness, leading in turn to the creation of more competitive products. This book establishes the full methodology for maintainability mathematics and modelling, as well as the relationship between the maintainability and maintenance processes.