General use by public officials can cover matters including public education, public radio and television broadcasting, the provision of services to the public, and so on. It is often accepted to be reasonable and justified for public officials to use the language of minorities, to an appropriate degree and level in their activities, when the numbers and geographic concentration of the speakers of a minority language are substantial enough. However, this is a contentious topic as the decision of substantiation is often arbitrary. The International Covenant on Civil and Political Rights, Article 26, does promise to protect all individuals from discrimination on the grounds of language. Following that, Article 27 declares, "minorities shall not be denied the right... to use their own language". The Convention against Discrimination in Education, Article 5, also does declares the rights for minorities to "use or teach their own language".