Abstract: Prognostics and systems health management(PHM)is an enabling discipline of technologies and methods with the potential of solving reliability,availability economic problems of military digital devices.This paper presents an assessment of the state of practice in prognostics and health management.While there are two general methods of performing PHM:model-based and data-driven methods-these methods by themselves have some key disadvantages.This paper presents a fusion prognostics approach,which combines or“fuses together”the model-based and data-driven approaches to enable markedly better prognosis of remaining useful life.