Abstract: A maintenance plan assistance system 100 configured to include: holding, in a storage device 101, remaining life information relating to devices covered by a maintenance plan, and a list of maintenance menus; and a computation device 104 identifying a maintenance effect when each maintenance menu is applied to each of the devices based on the maintenance menus and temporal changes in failure probabilities of each of the devices indicated by the remaining life information, identifying a variable range of a condition-based maintenance implementation timing, the variable range being dependent on the maintenance effect, and determining a maintenance menu including the variable range for a predetermined maintenance timing, and outputting, to a predetermined device, information including the maintenance menu identified by the determination and the condition-based maintenance implementation timing changed to the predetermined maintenance timing.

Abstract: The problem of the present invention is to establish how to more accurately estimate the failure probabilities of the components of a machine system that has a small number of failure records.

Abstract: The problem of the present invention is how to identify a failure probability function that defines failure occurrences of a device or a component of the device that is operated while undergoing maintenance in consideration of effects of the maintenance.