ABSTRACT
A defining feature of the analyses of this chapter is that the state of the system or component of interest is assumed to be the same as new following a maintenance activity. It treats the foundations of both the renewal and the nonrenewal cases. The chapter applies to the instantaneous repair case with renewal. It establishes the basic approaches to model formulation and analysis. The chapter highlights the questions one should consider in the study of repairable systems. For some systems, it is the periods of operation that are the greatest concern and the duration of repair is either negligible or unimportant. For those systems, treating repair as instantaneous is appropriate. The repair is assumed to be instantaneous and to yield device renewal. The logical step in studying repairable systems is to represent the simplest sequence of operating periods.
