Three Types of Reasoning

Critical thinkers need all three methods:

• Deduction — from general to specific; conclusion is guaranteed (All A are B; C is A; therefore C is B)
• Induction — from specific to general; conclusion is probable (Every swan I have seen is white; therefore all swans are probably white)
• Abduction — inference to the best explanation; conclusion is plausible (The grass is wet; the best explanation is that it rained)

Deduction is the safest but most limited. Induction builds knowledge from patterns. Abduction generates hypotheses. Science, detective work, and medical diagnosis all rely primarily on induction and abduction, not deduction.