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Deductive logic — the logic of what must be — reasons from the general to the specific. If the general rule is that all crows are black, and I see a brown bird, I can declare deductively that this bird is not a crow.

Inductive logic — the logic of what is operative — reasons from the specific to the general. If I study sales per square foot across a thousand stores and find a pattern that suggests stores in small towns generate significantly higher sales per square foot than stores in cities, I can inductively declare that small towns are my more valuable market

Whether they realize it or not, designers live in Peirce’s world of abduction

Dewey began to explore the limits of formal declarative logic — that is, inductive and deductive reasoning.