CONCEPT
Scaffolding vs. Replacement
The critical design distinction — borrowed from developmental psychology and pressed into service for AI — between tools that support cognitive effort and tools that eliminate it, determining whether friction removal preserves or destroys the training function friction performed.
The scaffolding-versus-replacement distinction identifies the critical design variable in AI-assisted cognitive work: whether the tool supports the user's cognitive engagement with a task or substitutes its own processing for hers. In developmental psychology, scaffolding refers to the temporary support an adult provides a child during learning — support that enables engagement with tasks slightly beyond current capacity, withdrawn as competence develops. The scaffolding is not the learning. The learning occurs when the child exercises the cognitive capacities the scaffolded task demands. Applied to AI, the distinction is between tools that scaffold the user's cognitive process — highlighting errors, suggesting approaches, providing diagnostic information the user then uses to make her own decision — and tools that replace the process, generating the output directly without the user's cognitive involvement.
In The You On AI Field Guide
The distinction matters because friction is training. When AI scaffolds, the prefrontal exercise is preserved: the user