The Comprehensive Large Array-data Stewardship System (CLASS) is a NOAA Information Technology (IT) enterprise solution supporting NOAA's data and science data stewardship missions. CLASS provides the mechanisms by which NOAA archive holders may securely store, maintain, and provide access to its data, information, and metadata holdings for indefinite periods. NOAA has directed that both legacy and emerging environmental observing systems requiring the long-term archive of data and information will use CLASS.

As an enterprise IT solution supporting archive, CLASS will apply emerging standards of the Global Earth Observation Integrated Data Environment (GEO-IDE), as they are identified, to integrate both with NOAA's non-archival systems as well as with legacy archive systems not migrated to CLASS.

CLASS will provide secure storage and access to environmental datasets while adhering to the principles of the International Standards Organization's Open Archival Information System (OAIS) Reference Model.