CCPR/C/21/Rev.1/Add.7 page 7 process so that electors have confidence in the security of the ballot and the counting of the votes. Assistance provided to the disabled, blind or illiterate should be independent. Electors should be fully informed of these guarantees. 21. Although the Covenant does not impose any particular electoral system, any system operating in a State party must be compatible with the rights protected by article 25 and must guarantee and give effect to the free expression of the will of the electors. The principle of one person, one vote must apply, and within the framework of each State's electoral system, the vote of one elector should be equal to the vote of another. The drawing of electoral boundaries and the method of allocating votes should not distort the distribution of voters or discriminate against any group and should not exclude or restrict unreasonably the right of citizens to choose their representatives freely. 22. State reports should indicate what measures they have adopted to guarantee genuine, free and periodic elections and how their electoral system or systems guarantee and give effect to the free expression of the will of the electors. Reports should describe the electoral system and explain how the different political views in the community are represented in elected bodies. Reports should also describe the laws and procedures which ensure that the right to vote can in fact be freely exercised by all citizens and indicate how the secrecy, security and validity of the voting process are guaranteed by law. The practical implementation of these guarantees in the period covered by the report should be explained. 23. Subparagraph (c) of article 25 deals with the right and the opportunity of citizens to have access on general terms of equality to public service positions. To ensure access on general terms of equality, the criteria and processes for appointment, promotion, suspension and dismissal must be objective and reasonable. Affirmative measures may be taken in appropriate cases to ensure that there is equal access to public service for all citizens. Basing access to public service on equal opportunity and general principles of merit, and providing secure tenure, ensure that persons holding public service positions are free from political interference or pressures. It is of particular importance to ensure that persons do not suffer discrimination in the exercise of their rights under article 25, subparagraph (c), on any of the grounds set out in article 2, paragraph 1. 24. States reports should describe the conditions for access to public service positions, any restrictions which apply and the processes for appointment, promotion, suspension and dismissal on removal from office as well as the judicial or other review mechanisms which apply to these processes. Reports should also indicate how the requirement for equal access is met, and whether affirmative measures have been introduced and, if so, to what extent. 25. In order to ensure the full enjoyment of rights protected by article 25, the free communication of information and ideas about public and political issues between citizens, candidates and elected representatives is essential. This implies a free press and other media able to comment on public issues without censorship or restraint and to inform public opinion. It requires the