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Many everyday devices, like thermostats and cruise control, utilize linear controllers -- which use simple rules to direct a system to a desired value.

Both also offer a robust set of driver assistance features including lane keeping assistance, blind-spot warning and adaptive cruise control.

Level 1, the most basic, relates to vehicles with features such as cruise control, while Level 5 is a fully-automated vehicle that can operate under any conditions and in any situation.

It seemed that goal would prove the difference as Celtic were in cruise control, but Aberdeen's substitutes prompted a late rally.

One idea is to segment it into levels in the same way that carmakers try to benchmark the path between cruise control and fully self-driving vehicles.