CEOS has started to work together with UNEP's IMEO following starting with a joint meeting in Harvard in June 2023. Initially a number of working groups was established by IMEO to lay down in more detail the best way forward. These groups involved various CEOS members and it would be good to continue these groups initially and then set up a more formal collaboration framework between CEOS agencies and IMEO. This activity will define and implkement this CEOS-IMEO interface.