This document contains two sets of revised guidelines pertaining to greenhouse gas (GHG) inventories of Parties included in Annex I to the Convention (Annex I Parties), adopted by the Conference of the Parties at its eighth session as annexes to decisions 18/CP.8 and 19/CP.8 (FCCC/CP/2002/7/Add.2). The first, “Guidelines for the preparation of national communications by Parties included in Annex I to the Convention, Part I: UNFCCC Reporting guidelines on annual inventories”, was adopted with decision 18/CP.8. This decision requires Annex I Parties to begin using these guidelines for reporting the annual inventories due in the year 2004. For inventory submissions due in 2003, the decision states that Annex I Parties should continue to use the original inventory reporting guidelines adopted with decision 3/C.P.5. Annual inventories of Annex I Parties are due by 15 April each year. The second, “Guidelines for the technical review of greenhouse gas inventories from Parties included in Annex I to the Convention”, was adopted with decision 19/CP. 8. This decision requires that these guidelines be used for the reviews of GHG inventories beginning in the year 2003. These guidelines have been compiled in a single document to facilitate ease of use by Annex I Parties