The Conference of the Parties (COP), by decision 15/CP.17, invited Parties included in Annex I to the Convention (Annex I Parties), in addition to the inventory submitted in line with the "Guidelines for the preparation of national communications by Parties included in Annex I to the Convention, Part I: UNFCCC reporting guidelines on annual inventories" adopted by decision 14/CP.11, to use the revised "Guidelines for the preparation of national communications by Parties included in Annex I to the Convention, Part I: UNFCCC reporting guidelines on annual greenhouse gas inventories" (hereinafter referred to as the UNFCCC Annex I inventory reporting guidelines), including the new common reporting format (CRF) tables contained in annex II to the decision, during a trial period from October 2012 to May 2013. The COP requested the secretariat to enable the use of the UNFCCC Annex I inventory reporting guidelines for the trial period by the provision of an upgraded or new version of the CRF Reporter software. It invited Annex I Parties to submit to the secretariat, by 3 May 2013, their views on their experience of using the revised UNFCCC Annex I inventory reporting guidelines and the upgraded CRF Reporter during the trial period. The secretariat has received five such submissions. In accordance with the procedure for miscellaneous documents, these submissions are attached and reproduced in the languages in which they were received and without formal editing.