CCPR/C/21/Rev.1/Add.7 page 5 vote on the ground of physical disability or to impose literacy, educational or property requirements. Party membership should not be a condition of eligibility to vote, nor a ground of disqualification. 11. States must take effective measures to ensure that all persons entitled to vote are able to exercise that right. Where registration of voters is required, it should be facilitated and obstacles to such registration should not be imposed. If residence requirements apply to registration, they must be reasonable, and should not be imposed in such a way as to exclude the homeless from the right to vote. Any abusive interference with registration or voting as well as intimidation or coercion of voters should be prohibited by penal laws and those laws should be strictly enforced. Voter education and registration campaigns are necessary to ensure the effective exercise of article 25 rights by an informed community. 12. Freedom of expression, assembly and association are essential conditions for the effective exercise of the right to vote and must be fully protected. Positive measures should be taken to overcome specific difficulties, such as illiteracy, language barriers, poverty or impediments to freedom of movements which prevent persons entitled to vote from exercising their rights effectively. Information and materials about voting should be available in minority languages. Specific methods, such as photographs and symbols, should be adopted to ensure that illiterate voters have adequate information on which to base their choice. States parties should indicate in their reports the manner in which the difficulties highlighted in this paragraph are dealt with. 13. State reports should describe the rules governing the right to vote, and the application of those rules in the period covered by the report. State reports should also describe factors which impede citizens from exercising the right to vote and the positive measures which have been adopted to overcome these factors. 14. In their reports, States parties should indicate and explain the legislative provisions which would deprive citizens of their right to vote. The grounds for such deprivation should be objective and reasonable. If conviction for an offence is a basis for suspending the right to vote, the period of such suspension should be proportionate to the offence and the sentence. Persons who are deprived of liberty but who have not been convicted should not be excluded from exercising the right to vote. 15. The effective implementation of the right and the opportunity to stand for elective office ensures that persons entitled to vote have a free choice of candidates. Any restrictions on the right to stand for election, such as minimum age, must be justifiable on objective and reasonable criteria. Persons who are otherwise eligible to stand for election should not be excluded by unreasonable or discriminatory requirements such as education, residence or descent, or by reason of political affiliation. No person should suffer discrimination or disadvantage of any kind because of that person's candidacy. States parties should indicate and explain the legislative provisions which exclude any group or category of persons from elective office.