Backward Reasoning
Updated 2026-08-11
INTRODUCTION
English translation pending.
CORE DEFINITION
Backward reasoning begins from the target or conclusion and searches for premises that would establish it, chaining backward until it reaches facts already known. Its advantage is selectivity: from a goal only a small number of rules can produce it, so the branching factor is low, whereas forward reasoning from known facts fans out into a space where most branches are irrelevant to the target.
SCAFFOLDING EFFECT
Reduce cognitive load
- Fix the goal: state the conclusion you are trying to reach. - Find its producers: list what would immediately imply it. - Recurse: chain backward until you touch something known.
Anchor fast decisions
Search cost depends on the branching factor, and a goal has few producers while a fact has many consumers. Reasoning from the goal therefore explores a narrow tree, and each backward step preserves the relevance of everything before it, which is why it converges faster on the same problem.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Backward_chainingverified
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