Operate To Failure involves no advanced planning other than ensuring that enough resources are available to carry out appropriate repairs following plant failure. This is usually the least desirable strategy to employ, as the planning and control becomes very difficult to predict and the equipment can breakdown at any time.
All of the other four maintenance strategies, to some extent, allow for repair or overhaul to be scheduled so that production loss is minimised. Operate To Failure by its nature will result in breakdowns occurring when the equipment is in use.
The correct strategy to employ on non-critical equipment, or where suitable standby equipment is available.