Preventive work is time or usage based
Tasks are scheduled before known deterioration or wear is expected to become unacceptable.
Predictive work uses condition information
Measurements or inspections can help target interventions when condition indicates a need.
Corrective work follows a defect or failure
This can be reasonable for low-consequence items but risky for assets whose failure disrupts important service.
Strategy should match consequence
The appropriate mix reflects service impact, detectability, access, cost and the owner’s tolerance for interruption.
Scope. This page explains asset-management concepts, not operating procedures for critical infrastructure. Inspection methods, intervention thresholds and safety decisions must follow the asset owner’s standards, local rules and qualified professional judgement.