Think of all the pieces of equipment and systems you are using right now and how critical they are to your operations. Would you take any chances?
You do everyday when you haven't performed Qualification or validation.
How do you know it works? How do you know when it's stressed and pushed to the limits, it will perform and ensure you are safe.
The RP will ensure validation and qualification is performed on all systems, and pieces of equipment that are critical to the business.
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The RP will use multiple metrics to establish the extent and frequency of the validation. These are based off risk when in use, and simplicity of design. For example, a back up generator will only ever be used in extreme circumstances, however this will be a very high risk event, so validation must be extensive and all encompassing.
Whereas a data logger used to monitor temperature within the warehouse will be validated to ensure usage is safe and accurate but the majority of the validation will be referencing the re-calibration certificates. It will be low risk as we should always have spare loggers available, and the systems in place to control temperature should also always be in place.