The Scientific Council shall trial the use of the guidelines as documented in the Annex to UNEP/CMS/Resolution 11.33 (Rev.COP12) on Guidelines for Assessing Listing Proposals to Appendices I and II of the Convention, as a guide in assessing proposals to list migratory species in Appendices I and II, and report back to the 13th meeting of the Conference of the Parties on their effectiveness.