| Class |
Natural Language Definition |
| degraded state |
state of reduced ability to perform as required but with acceptable reduced performance |
| disposition to exhibit undesirable behavior |
disposition of an item to exhibit undesirable behavior |
| disposition to fail |
disposition of an item to undergo a failure process or exhibit undesirable behavior |
| failed state |
state of an item being unable to perform a required function due to a failure event |
| failure effect |
process that is the consequence of failure, within or beyond the boundary of the failed item |
| failure event |
event that causes an item to lose its ability to perform a required function |
| failure mode code |
information content entity that describes an undesireable disposition |
| failure process |
process that changes some quality of an item causing the the item to become degraded or failed |
| functioning process |
process that enables an item to perform a function |
| maintenance activity |
maintenance process that is a single task to retain or restore the function of a maintainable item |
| maintenance process |
process to do with retaining or restoring the function of a maintainable item under a maintenance strategy |
| maintenance state |
stasis that holds during a temporal interval when the realizable functions and capabilities of the participating item, or the grade of realization of those functions and capabilities, remain unchanged |
| maintenance strategy |
maintenance (method/ approach/ actions) to enable (the/an) asset to achieve (management's/ desired) objectives |
| maintenance work order record |
information content entity that describes a maintenance process |
| operating state |
state of an item being able to perform a required function assuming that the external resources, if required, are provided |
| person qualification specification |
requirement specification that identifies the need for a person to have an assessed skill for a specific task |
| qualified maintenance person |
person who is qualified to perform a specified specified maintenance process or task |
| required function |
function of a maintainable item which is considered necessary to fulfil a process requirement |
| supporting maintenance activity |
single action in support of the execution of a maintenance process |
| undesireable disposition |
disposition of an item to undergo a process that leads to undesirable outcomes |