Structure
Prompt 1: 'Decompose this problem into subproblems.' Prompt 2: solve each. Prompt 3: compose.
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Advantage over CoT
Handles problems too big for single reasoning chain. Each sub-solution is verifiable. Modularity.
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Applications
Long-form writing. Complex code. Multi-step planning. Anything where a single CoT would run out of steam.
Coupling
Watch dependencies. Order matters. Some frameworks (e.g., ReWOO) plan the DAG upfront then solve topologically.