Are you an Army cook and you need to fry eggs? There are Tasks, Conditions and Standards for that. A scientist friend pointed that in the computer world this is algorithm thinking. Break down every task into steps, clearly define the steps, evaluate.
A complex operation pulls together dozens and dozens of different Tasks, Conditions and Standards and turns that into one smooth operation. The posts I did recently on Tank Gunnery represented hundreds of individual bits of training from how to zero each of the three weapons on the tank, how to drive with the hatches open and closed, how to determine range, how to maintain the tracks on the vehicle, etc.
When we pass the tests at the end of Tasks, Conditions and Standards, the Army says, "We got Skillz!"