Which statement is NOT a consideration for critical limits?

Which statement is NOT a consideration for critical limits?

• A. If a critical limit is met, a hazard is automatically controlled
• B. Critical limits must be achievable
• C. There are often multiple control options
• D. Selection is driven by practicality and experience

Answer: (A)

Critical limits are the thresholds that separate acceptable from unacceptable operation at a critical control point, guiding when a control measure is working to prevent or reduce a hazard. The idea that simply meeting a critical limit automatically means the hazard is controlled is not correct. Meeting the limit indicates the process is within the defined boundary, but it does not guarantee hazard control in every situation because of potential measurement error, process variability, drift, or other factors that could undermine effectiveness. Ongoing monitoring, verification, and corrective actions are still required to ensure true control. In contrast, good critical limit design considers that the limit must be achievable with the equipment and process, that there are often multiple ways to control a hazard, and that selection of controls is guided by practicality and experience to ensure reliable implementation.

Critical limits are the thresholds that separate acceptable from unacceptable operation at a critical control point, guiding when a control measure is working to prevent or reduce a hazard. The idea that simply meeting a critical limit automatically means the hazard is controlled is not correct. Meeting the limit indicates the process is within the defined boundary, but it does not guarantee hazard control in every situation because of potential measurement error, process variability, drift, or other factors that could undermine effectiveness. Ongoing monitoring, verification, and corrective actions are still required to ensure true control. In contrast, good critical limit design considers that the limit must be achievable with the equipment and process, that there are often multiple ways to control a hazard, and that selection of controls is guided by practicality and experience to ensure reliable implementation.