'individually-controlled' originates from the combination of 'individual' and 'control,' where 'individual' comes from Latin 'individuus,' meaning 'indivisible,' and 'control' from French 'contreroller,' meaning 'to check or regulate.'

'individually-controlled' evolved from the concept of personal management and regulation, combining the idea of individual autonomy with control mechanisms.

Initially, it meant 'managed by a single person,' and this meaning has largely remained the same in modern usage.