'scale-based' originates from the combination of 'scale' and 'based', where 'scale' refers to a graduated range of values and 'based' means founded on or derived from.

'Scale' comes from the Latin word 'scala', meaning 'ladder' or 'staircase', and 'based' is derived from the Old French 'basse', meaning 'foundation'.

Initially, 'scale' referred to a physical balance or weighing device, but over time it evolved to mean a range of values or levels, while 'based' has consistently meant 'founded on'.