Table 1.

Maintenance Strategy Characteristics

Maintenance Strategy	Reactive Maintenance (RM)	Preventive Maintenance (PM)	Predictive Maintenance (PdM)	Proactive Maintenance (PaM)
Maintenance Interval	Fail-and-fix	Time based; Usage based	Reliability based; Condition based	Improve & sustain
Object	Component; Sub-system; System	Component; Sub-system; System	Component; Function; System	Component; Function; System
Planning & Scheduling	Planning on the fly	Planning & scheduling based on ideal PM interval	Predictive planning & scheduling	Proactive planning & scheduling
Human Factors (inspection & decision-making)	Medium to 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 to Medium	High	High