A NASA technician inspecting the wind tunnel model for reliability

The ability of a system or component to perform its required functions under stated conditions for a specified period of time


  • Fault diagnosis - the detection and analysis of faults in machines
  • Fault tolerance - a design of an object or system that allows the object to continue operation rather than failing completing in the event of a fault or faults
  • Maintenance - keeping products or objects in working condition
  • Reliability engineering - engineering an object or system to minimize faults or failures
  • Stability - the maintenance of function after perturbations in conditions