These are the same set of tools developed for prognostics. CALCE is at the forefront of research in Prognostics and Health Management (PHM). Many of these prognostics were connected with celestial events. Ahom religion has various manuscripts on Divination, Prognostics, khwan calling, incantation, Phralung. Potential uses for prognostics is in condition-based maintenance. A robust prognostics performance evaluation must incorporate the effects of this uncertainty.