# 3.9.2 Validation of processes Summary of actions * Validate processes and procedures to ensure that they are effective in controlling hazards. * Revalidate processes periodically or when variations in conditions occur. Validation involves evaluating the scientific and technical information that is available on processes and then, where necessary, undertaking further investigations, in order to validate system-specific operational procedures, critical limits and target criteria. The aim of process validation is to ensure effective operation and control. Historical data and operational experience can also be useful sources of information. It is important that the validation considers the totality of multiple treatment barriers in achieving the health-based targets. Processes should be revalidated on a regular basis or when variations occur (e.g. seasonally). Any new processes should be tested using benchtop, pilot-scale or full-scale experimental studies to confirm that the process and operational criteria produce the required results under the conditions specific to the individual water supply system. Section 9.8 provides more information on validation of processes. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://guidelines.nhmrc.gov.au/australian-drinking-water-guidelines/part-1/chapter-3/3.9-research-and-development-element-9/3.9.2-validation-of-processes.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.