Related:
* Healing
* Malfunctioning
* Item durability

For strategy games this mainly means that player can either build and control engineers or similar or player can direct units to return to some structure or place where they are repaired.

For most other games this means the player has knowledge how to repair machines, or can otherwise restore them to better working order.

As opposed to picking up automatic repair kits or similar.

Limitations:
* Repairing buildings or other such structures should not be included.