Purpose–This paper aims to clarify emerging aspects and trends of Six Sigma literature over
17 years, from 1992 to 2008. Design/methodology/approach–The literature on Six Sigma …

This book aims to present a state-of-the-art survey of theories and methods of reliability,
maintenance, and warranty with emphasis on multi-unit systems, and to reflect current hot …

This paper presents a concise review of the optimisation models for the preventive
repair/replacement/inspection of components/assemblies/subsystems with the aim of …

In general, a newly purchased item or system is warranted for a specific period. When the
system fails during the warranty period, it is repaired free of charge. Even if the system is …

Many factors should be considered in modeling DWC (discounted warranty cost) of
repairable systems or products including system structure, components' failure processes …

This paper considers two classical age-based replacement models within a discrete-time
framework: a standard age replacement model and an opportunistic age replacement …

An important problem in maintenance planning is the repair versus replacement problem
which consists of a sequence of decision points over time, whereby decisions are made to …

We define what is a replacement policy for a system that fails randomly in time and its main
characteristics. There are several parameters that drive the structure of the optimal policy …

In this paper we consider the optimal (T, S)-policies in a discrete-time opportunity-based age
replacement (DOAR), where S is a restricted duration of opportunities and T (≥ S+ 1) is a …

This article considers when preventive maintenance (PM) and replacement should be
implemented for a repairable series system with failure interaction. Under the main …