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This paper presents a novel approach for incorporating condition information based on historical data into the development of reliability curves. The approach uses a variation of Kaplan-Meier (KM) estimator and degradation-based estimators of survival patterns. From a statistical perspective, the use of KM estimator to create a reliability curve of a specific type of equipment, results in a general curve that does not take into consideration the instantaneous condition of each individual equipment. The proposed degradation-based estimator updates the KM estimator in order to capture the actual condition of equipment based on the detected patterns. These patterns identify interactions between condition indicators. The degradation-based reliability curves are obtained by a new methodology called `Logical Analysis of Survival Data (LASD). LASD identifies interactions between condition indicators without any prior …