This document presents quality assessment tools that can be applied as soon as data are delivered to the CMEMS production units, as well as reprocessing tools. The latter requires a certain knowledge about the type and structure of the data in order to build the control quality test.

In addition, a set of tools have been developed for the evaluation of the tests themselves and are likely to be applied on monthly and history repositories only. These evaluation tools are not expected to be implemented at production unit (PU) level, but applied by experts and scientists. The resulting analysis should confirm or provide an upgrade of the quality control tests implemented at PU level.