Guardrails Keep Local Wins From Becoming Global Losses
Define the role of guardrail metrics when a local experiment metric improves but system health may worsen.
Principle: Protect the system while you improve one behavior inside it. What Guardrails Do A target metric names the behavior you want to move. Guardrails name the damage you refuse to cause while moving it. Why It Works The North Star focuses the whole system on durable value. AARRR shows which neighboring stages may absorb the cost of a local push. RICE improves prioritization because likely negative side effects should reduce confidence or expected impact. Practical Move Before launch, finish this sentence: "We win if [target metric] improves, unless [guardrail 1] or [guardrail 2] crosses the line."
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