SHERPA's new JULIET service breaks down the differing requirements from each of the Research Councils to try and simplify what the policy says has to be done, what authors should archive, when they should archive, and where they should archive their outputs. The list then categorises the different sets of advice in comparison to an ideal Open Access mandate. The JULIET list complements the well-known RoMEO list, which summarises publishers' permissions for archiving research articles.