'well-structured' originates from the combination of 'well' and 'structured', where 'well' is an adverb meaning 'in a good or satisfactory way' and 'structured' is the past participle of 'structure', meaning 'to arrange or organize'.

'well-structured' evolved from the Middle English word 'structuren', which meant 'to build or arrange'.

Initially, it meant 'arranged in a particular way', but over time it evolved into its current meaning of 'organized in a clear, logical, and effective manner'.