Garbage In-Garbage Out

Principle

Quality of output depends on quality of input. • Two problem types: type errors (wrong input) and quality errors (bad but right format). • Prevent type errors using affordances and constraints. • Prevent quality errors using previews and confirmations. • Widely applicable beyond computing (e.g., business, nutrition).

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Immersion

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Constraint

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Accessibility

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Similarity

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Constancy

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Mapping

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