Applying Process-based Analytics to Audit Results for Process Management and Improvement
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The document discusses using process-based analytics and control charts to improve operational audits and inspections of food safety systems. Key process indicators identified during audits should be plotted on control charts to identify trends so issues can be addressed before food safety incidents occur. Control charts of microbial environmental monitoring data over time can reveal problems with cleaning programs. Internal audits then verify that feedback from operational audits is being used effectively to improve processes based on data trends. Linking all verification activities helps ensure a robust food safety management system.
Applying Process-based Analytics to Audit Results for Process Management and Improvement
- 1. Applying Process-based Analytics to Audit Results for Process Management and Improvement John G. Surak, PhD Jeffery L. Cawley Surak and Associates Northwest Analytics Clemson, SC Portland, OR
- 2. Operational audits and inspections play a critical role in assuring the effectiveness of food safety system (Table 1). To achieve maximum effectiveness of these activities, key process indicators should be identified and plotted on control charts. The control charts can then be assessed for trends, so actions can be taken before a food safety incident occurs. Preoperational Audit Facility Audit Pest Control Audit Microbial Environmental Monitoring Audit Table 1 – Examples of Operational Inspections and Audits
- 3. The GFSI benchmarked audit schemes require that food processors conduct an internal audit. The internal audit should determine the conformance of the Food Safety Management System (FSMS) to plan. It is used to answer the following questions: • Is the FSMS implemented? • Is the FSMS effective? • Is the FSMS efficient? • Is the FSMS sustainable? • Is the FSMS updated? The internal audit is not a substitute for the other audits. The primary focus of the operational inspections and audits is to determine if the food safety activities are being carried out. The primary focus of the internal audit should to determine if the FSMS is working as planned.
- 4. This will cause a shift in the types of audits that are conducted from a checklist approach to a process approach. For example, a checklist for a preoperational audit may ask the question, “Are the floors clean?” The auditor may observe that a floor is not properly clean. Using the process audit concept, the auditor may ask additional questions that focus on gathering information on why the floor is not clean. In addition, the auditor may be also responsible for taking microbiological environmental samples and reporting the results to the manager responsible for cleaning and sanitizing. Individual results of the weekly microbial environmental monitoring audit, reported as CFUs/inch², will summarize the effectiveness of the cleaning program for that week.
- 5. The auditor should also plot the microbial data over a period of time to determine if there are any trends in the cleaning and sanitizing program.
- 6. Control charts can be used to display the sanitation data. Examples of these plots are shown in Figures 1 and 2. Figure 1 shows the plot of environmental samples over a period of a half of year. The samples were taken after cleaning and before sanitization. The graph shows a number of signals as indicated by the red diamonds. These signals show that there was a change in the cleaning process. The auditor responsible for taking and analyzing the data should provide feedback that problems were observed in the effectiveness of the cleaning program so that the cleaning and sanitizing program can be improved.
- 8. The function of the internal audit is to verify the effectiveness of the FSMS or determine that the organization is functioning according to plan. In the previous example, the internal audit primary focus is to determine if the verification system for cleaning and sanitizing is properly working. For example, during the planning part of an internal audit that focuses on cleaning and sanitizing, the auditor can review records which include control charts. The internal auditor may conduct further analysis of the microbial data.
- 10. Figure 2 show a second control chart of the same microbial data. In this chart, the control limits were calculated by each quarter. In addition to the signals that were observed in Figure 1, the second control chart indicates that there was an increase in the variation of microbial levels between the first quarter and the second quarter. As part of this audit, the auditor should investigate what was done with the original environmental sampling information. Did the auditor who was responsible for taking the environmental samples provide effective feedback to plant management responsible for cleaning and sanitization? Did the plant determine why the cleaning process deteriorated? If a root cause was identified, was this knowledge used to improve the cleaning and sanitizing process?
- 11. Operational Operational Verification of Internal Management Certification Food Safety Food Safety Audits Review Audits Activities Activities Figure 3: Linkage between operational activities and the Food Safety Certification Audit
- 12. Finally the internal audit reports and findings feed into management review, to assess the effectiveness of the FSMS, and develop objectives and business plans to update and improve the FSMS. Figure 3 shows the linkage of food safety activities linkage to certification audits. The proper linkage and operation of the components of the FSMS allows for successful certification audits and gives confidence to Senior Management and other stakeholders that the organization has a robust food safety management system. Contact information: John G. Surak Jeffery L. Cawley Principal Vice President Industry Leadership Surak and Associates Northwest Analytics Clemson, SC Portland, OR 864-506-2190 jcawley@nwasoft.com jgsurak@yahoo.com 503-224-7727