Artificial Intelligence / Unit 5 AI 0229 short lesson, about 20 seconds
Top-Down: Start from the Question
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The idea
The top-down procedure works backward from a query: a goal is established by finding a rule whose head matches and taking its body as new subgoals, down to established facts.
In practice
Asked one question, the procedure explores exactly that question's ancestry and touches nothing else.
Where people slip
A goal matching no fact and no rule head is a dead end — backtracking applies here too.
Your place on the trail
Every lesson rests on earlier ones and opens later ones. Tap any to jump.
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