Discussion of eligibility relates firstly to the requirements for Annex B Parties to be eligible to participate in the three Kyoto Mechanisms and secondly to whether a project would be eligible to qualify for credit under the CDM. In the first case, Parties are eligible to participate in the Kyoto Mechanisms if they meet certain requirements. These include: being in compliance with commitments under Articles 5 and 7 and submitting the last available national inventory report; having a national system for the estimation of GHG emissions; and having ratified the Protocol. In the second case, eligibility in the CDM refers to the type of technology or project that would qualify for credit. This may depend on the sustainable development criteria of the host country, the size of the project and the type of technology used, e.g.nuclear, fossil fuel or renewable (see ‘Positive and Negative Lists’).