Use a matrix to map workflows by knowledge volatility and behavior stability.
Need for identical stable behavior How fast the underlying facts change Low High Prompt Low change · Low discipline Use clear instructions and a few examples. Do not overbuild a small, stable task. Prompt + Tune Low change · High discipline Prove the pattern with prompting, then fine-tune if the stable behavior must hold across high volume. Prompt + RAG High change · Low discipline Retrieve current evidence and let prompts shape a reasonable answer format. RAG + Behavior layer High change · High discipline Retrieval owns freshness; prompting or fine-tuning may still shape the repeated delivery behavior on top.
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