A/HRC/5/21 page 7 12. The first member and observer States to be reviewed will be chosen by the drawing of lots from each Regional Group in such a way as to ensure full respect for equitable geographic distribution. Alphabetical order will then be applied beginning with those countries thus selected, unless other countries volunteer to be reviewed. 13. The period between review cycles should be reasonable so as to take into account the capacity of States to prepare for, and the capacity of other stakeholders to respond to, the requests arising from the review. 14. The periodicity of the review for the first cycle will be of four years. This will imply the consideration of 48 States per year during three sessions of the working group of two weeks each.1 D. Process and modalities of the review 1. Documentation 15. The documents on which the review would be based are: (a) Information prepared by the State concerned, which can take the form of a national report, on the basis of general guidelines to be adopted by the Council at its sixth session (first session of the second cycle), and any other information considered relevant by the State concerned, which could be presented either orally or in writing, provided that the written presentation summarizing the information will not exceed 20 pages, to guarantee equal treatment to all States and not to overburden the mechanism. States are encouraged to prepare the information through a broad consultation process at the national level with all relevant stakeholders; (b) Additionally a compilation prepared by the Office of the High Commissioner for Human Rights of the information contained in the reports of treaty bodies, special procedures, including observations and comments by the State concerned, and other relevant official United Nations documents, which shall not exceed 10 pages; (c) Additional, credible and reliable information provided by other relevant stakeholders to the universal periodic review which should also be taken into consideration by the Council in the review. The Office of the High Commissioner for Human Rights will prepare a summary of such information which shall not exceed 10 pages. 16. The documents prepared by the Office of the High Commissioner for Human Rights should be elaborated following the structure of the general guidelines adopted by the Council regarding the information prepared by the State concerned. 1 The universal periodic review is an evolving process; the Council, after the conclusion of the first review cycle, may review the modalities and the periodicity of this mechanism, based on best practices and lessons learned.