The Expert Team on Data Standards (ET-Data) maintains and develops the Manual on Codes (WMO-No. 306, Vol. I.2 and I.3) to meet the needs of Members, WMO Earth system disciplines, and partner organizations. The team examines CF-netCDF requirements and extensions in collaboration with the CF community, explores new data formats, supports experimental data exchanges, provides guidance on WMO data standards, and maintains codes.wmo.int in line with evolving standards.