The aim of the Mission Performance Cluster service is to monitor the instrument performance and perform all expert activities necessary to ensure that User Level Data meet the calibration and validation specifications. The Calibration and Validation operations are fulfilled by the Mission Performance Cluster services in the form of operational services provision.

The Calibration and Validation functions encompass all expert activities to monitor the instrument performance, to characterise the User Level Data quality, to assess the achievement of the expected quality levels according to the product specifications, to perform all necessary activities to derive and maintain the calibration information, to perform all necessary activities to derive and maintain the validation information and to characterise the User Level Data quality and its calibration and validation levels. The function includes the scientific algorithm definition and maintenance, in particular the definition and maintenance of the Level-2 algorithms and the implementation and maintenance of the Level-2 data processors.