Monitoring is the scheduled measurement or observation of a CCP relative to its critical limits. Effective monitoring procedures must specify what is being measured, how the measurement is taken, when and how frequently it occurs, and who is responsible. Monitoring methods can be continuous, such as temperature recorders on ovens and pasteurizers, automatic metal detector rejection systems, or pH controllers in fermentation tanks. Batch monitoring includes manual temperature checks, visual inspections, and laboratory testing. Continuous monitoring is preferred where feasible because it provides real-time data and immediate detection of deviations.
Corrective actions are pre-established procedures to be followed when monitoring indicates a deviation from a critical limit. The corrective action must address two elements: bringing the process back under control, and handling the product produced during the deviation. Products produced while a CCP was out of control must be evaluated for safety, typically through segregation, review of processing records, or laboratory testing. If the product is deemed unsafe, it must be destroyed or reworked through an established process. All corrective actions must be documented, including the nature of the deviation, root cause analysis, and disposition of affected product.
Verification encompasses activities that confirm the HACCP system is functioning as intended. Verification procedures include calibration of monitoring equipment (thermometers, pH meters, metal detectors), targeted sampling and testing of finished products, review of CCP monitoring records and corrective action logs, observation of monitoring activities by supervisory personnel, and periodic internal and external audits. Verification is distinct from monitoring — monitoring occurs in real time at CCPs, while verification provides retrospective confirmation that the system is operating correctly.
Validation is a separate but related activity that occurs before and during HACCP plan implementation. Validation establishes scientific and technical evidence that critical limits at CCPs are capable of achieving the intended hazard control. For example, validation of a cooking CCP requires scientific literature, challenge studies, or regulatory documents demonstrating that specified time and temperature combinations achieve the required log reduction of target pathogens. The entire HACCP plan should be reassessed at least annually and whenever changes occur in raw materials, product formulation, processing equipment, or regulatory requirements. Monitoring and verification are essential components of the HACCP plan, supported by thorough HACCP plan documentation. CCP monitoring targets the critical control points identified during plan development.
