A specific description of a unit of work activity that is a logical and necessary action in the performance of a behavior; how the behavior is demonstrated or performed in a particular context.
 
From PMS 310-1
 

A form of high cloud, composed of ice crystals, which seldom obscures the sun.

Pertaining to, or caused by mountains.

The evaluation of the fire to determine a course of action for suppression.

An area that, in relation to wildland/urban fire, has a set of conditions that provides the opportunity for fire to burn from wildland vegetation to the home/structure ignition zone.

The transformation of a liquid to its gaseous state; heat is released by the liquid during this process.

Pilot who is designated to be second-in-command of an aircraft during flight time.

A combination hoe or cutting tool and rake, with or without removable blades.

The ICS section responsible for providing facilities, services, and supplies in support of an incident and personnel well being. The logistics section may include units and branches.

Medical Unit staff are responsible to plan for and provide health and medical services for incident personnel.