Maintenance strategy evolution.
|Maintenance strategy||Reactive maintenance (RM)||Preventive maintenance (PM)||Predictive maintenance (PdM)||Prognostics & health management (PHM)|
|Maintenance interval||Fail and fix||Time based; usage based||Reliability based; condition based||Improve & sustain|
|Object||Component||Component; function;||Component; function; system||Component; function; system|
|Planning & Scheduling||Planning on the fly||Planning & scheduling based on optimal PM interval||Predictive planning & scheduling||Proactive planning & scheduling|
|Failure severity and frequency||Low severity, low frequency||Low to medium severity, high frequency||Medium to high severity, low frequency||High impact, high frequency|
|Human factor (inspection & decision-making)||High||Intermediate||Low||Low (false alarm)|
|Cost effectiveness||Labor intensive; Labor and material||Costly due to over maintenance or ineffective & inefficient PM||Cost-effective; extended life & less failure-induced costs||Cost-effective: Substantially save failures & extend the life of equipment|
|Requirement for technology readiness||Low||Low||High||High|
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