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CPP stands for Critical Process Parameter. It is a process variable—such as temperature, time, pressure, mixing speed, humidity, pH, fill volume, drying conditions, or an equipment setting—that can affect a product’s critical quality attributes. Monitoring CPPs helps ensure that quality is controlled throughout production rather than assessed only through final testing.
Electronic Batch Record (EBR) systems enable the digital monitoring of CPP values during production, comparison with limits, visualization of deviations, and use in quality assessments. Therefore, CPP management is one of the most important control layers of EBR. Centra's Electronic Batch Record (EBR) solution contributes to associating critical process parameters with production records and making them traceable in quality processes.
The Basic Logic of the CPP Concept
What is CPP?
CPP (Critical Process Parameter) is a process parameter that can affect product quality and therefore must be controlled within certain limits. For a parameter to be considered a CPP, it must have a significant impact on the safety, efficacy, quality conformity, or critical quality characteristics of the product. For example, granulation time, drying temperature, mixing speed, or filtration pressure in sterile products can be considered CPPs.
Why is CPP defined as critical?
Because uncontrolled changes in these parameters can affect the critical quality characteristics of the product. For example, drying at an unnecessarily low temperature can increase the moisture content; while drying at an unnecessarily high temperature can negatively affect product stability.
What is the relationship between CPP and CQA?
CPP and CQA are two complementary concepts. CQA refers to the critical quality characteristic of a product, while CPP refers to the process variable that affects this quality characteristic. For example, the dissolution profile of a tablet could be the CQA; granulation parameters, compression force, or coating conditions could be CPPs that influence this CQA.
Why is this relationship important for EBR?
EBR records not only the final result data but also the production conditions that influenced the result. Thus, when a quality problem occurs, not only the final QC result but also the CPP values that may have affected that result can be examined.
How is CPP determined?
The CPP (Critical Process Parameter) determination process is carried out through product development, process validation, risk analysis, historical production data, scientific knowledge, and quality experience. Not every parameter in the production process is critical. Parameters considered critical are those variables that have the potential to significantly impact CQA (Critical Quality Attribute) and can pose a quality risk if left uncontrolled.
What questions are asked in determining CPP (Critical Process Parameter).
Questions such as whether changing this parameter will affect product quality, whether it has a measurable effect on CQA, whether it could lead to out-of-specification results, whether it has been identified as critical in process validation, and whether continuous monitoring is required are important in determining CPP.
How to track CPP in EBR?
In EBR systems, CPP values are tracked in relation to production steps. The operator can enter a value, the system can automatically retrieve data from the device, or equipment parameters can be recorded via integration. The entered values are compared with defined lower and upper limits. Values outside or approaching the limits can be flagged by the system.
What are the advantages of digitalization in CPP tracking?
Digital tracking makes values readable, timestamped, user-associated, and analyzable. An out-of-limit value that might be noticed later in a paper record can be seen in the EBR during production.
How are CPP limits managed?
CPP limits should be determined based on approved process information, validation results, specifications, and quality risk analysis. Within the EBR, these limits can be defined digitally. Different control levels can be created, such as lower limit, upper limit, target value, alert level, and action level.
Are warning limit and action limit the same thing?
No. The warning limit indicates that the process is approaching a critical zone. The action limit, on the other hand, represents a more serious situation requiring intervention or a formal quality assessment. EBR can display these levels separately.
Frequently Asked Questions about CPP
What are some examples of CPP (Critical Process Parameter)?
Examples of CPP (Critical Process Parameter) vary depending on the type of production. In tablet production, mixing time, granulation liquid quantity, drying temperature, compression force, and coating temperature can be important. In sterile production, filtration pressure, filling volume, sterilization temperature, time, and environmental conditions can be considered critical process parameters.
Is every process parameter a CPP (Critical Process Parameter)?
No. Every process parameter can be monitored; however, not all of them are critical. To be classified as CPP (Critical Process Parameter), it must have a significant impact on product quality.
How to manage CPP deviation?
When the CPP value exceeds the defined limits, the system may issue a warning, lock the step, or initiate a deviation process. This situation is evaluated according to quality procedures. The impact of the deviation on product quality, its root cause, and the risk of recurrence should be examined.
Does out-of-limit CPP always mean product rejection?
No. An out-of-limit CPP requires a quality assessment; however, it doesn't mean the product will be automatically rejected. QA and relevant technical teams will evaluate the impact of the deviation.
How are CPP data used in process validation?
In process validation, it must be demonstrated that CPP values can be controlled within specified ranges and that the product meets CQA requirements under these conditions. EBR can strengthen this evidence by regularly collecting CPP data from validation batches.
Why is CPP important in continuous process verification?
Continuous process verification (CPP) monitors whether the process remains under control throughout commercial production. When CPP data is analyzed over time, process drifts, increased variability, or equipment-related problems can be detected earlier.
How are CPP data evaluated in ePQR?
In ePQR processes, CPP data is used to evaluate the periodic process performance of a product. By comparing temperature, time, pressure, humidity, or other critical values in different batches of the same product, the stability of the process can be analyzed.
What does CPP trend analysis show?
Trend analysis shows whether parameters are moving away from the target value over time. Even if a CPP value hasn't yet gone outside the limit, if it's consistently shifting in the same direction, preventative action may be necessary.
How does Centra support EBR CPP tracking?
Centra EBR can support the digital definition of critical process parameters, their association with production steps, control with limits, and monitoring with electronic signatures and audit trails. Thus, CPP data is not only recorded but also becomes usable in quality decision-making.
What should businesses do if they want to start implementing CPP management?
Businesses should first identify critical process parameters on a product basis, analyze which CQA (Critical Quality Attribute) parameters affect, and plan how to track them within the EBR. To digitize CPP management and link it to electronic batch records, you can contact Centra via their information page.
