It follows from the above standards that the right to political participation is not absolute. International treaties – as well as national constitutions - establish restrictions on its exercise, which may differ in scope and aims. The most common requirements are citizenship and age, and there is a broad range of possible additional restrictions. The scope of the right to be elected is determined by the system or form of government, which in turn is decided by the people who are the sovereign constitution-making entity. In general, therefore, restrictions to the human right to political participation and to stand for election are allowed within a constitutional democracy to the extent that they are based in law, reasonable and objective. As long as these conditions allow for reasonably free access to office, are prescribed by law, pursue legitimate aims, are necessary in a democratic society and are not discriminatory, they should be permitted.