Basic Definitions of Calculations in Work History Cube

The following table lists the basic calculations and the definitions of the measures provided in the Work History cube.

Measure	Definition
Corrective Work	Corrective Work Orders are repair work orders associated with restoring an asset after a breakdown or in response to performance degradation. It can also be the work to restore the asset to its prime condition as a result of a predictive maintenance (PdM) activity finding. Corrective Work = Breakdown Repairs + Degradation Repairs
Critical Assets	The assets with high criticality.
Failure Event	The repair events with breakdown.
Mechanical Downtime	The amount of time a piece of equipment is not operating due to a work event or failure. The calculation for this measure is: Maintenance Completion Date - Maintenance Start Date
Proactive Work	Proactive work is maintenance work that is completed to avoid failures or to identify defects that could lead to failures. It includes routine preventive and predictive maintenance activities and work tasks.
Reactive Work	Reactive work is maintenance work that breaks into the weekly schedule. Reactive work cost is calculated using the priority on the work order. Emergency Work Orders are considered to be breaking into the weekly schedule. Any order type except for miscellaneous can be included in this calculation.