Prominent statisticians and reliability experts contributed to this book which is of interest to reliability theoreticians and analysts. The book is divided into two sections: - Experts' Opinions; - Accelerated Life Testing. Section one deals with the following issues: - the axiomatic development of subjective probability and utility; - pooling expert-opinions; - selection models; - the Bayesian definition of exponentiality; - exchangeability in Probabilistic Safety Assessment (PSA); - influence diagrams as modeling alternative to decision trees. The section also includes a survey of applications of expert judgements in reliability and PSA practice. Section two contains the following: - a comparison of the Bayesian and non-Bayesian approaches; - a presentation of the applications of the Kalman filter; - an analysis of a Bayesian case-study relative to Kevlar/Epoxy spherical pressure vessels."