Special cause of the variation
1. When a system is known to be stable, why should we ask "What is the common cause of the variation?"
2. When a system is known to be unstable, why should we ask "What is the special cause of the variation?"
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When a system is known to be stable, why should we ask "What is the common cause of the variation?" When a system is known to be unstable, why should we ask "What is the special cause of the variation?"
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