4 (Articles 16–25) governs reporting and monitoring of the Covenant and the steps taken by the parties to implement it. It also allows the monitoring body – originally the United Nations Economic and Social Council – now the Committee on Economic, Social and Cultural Rights – see below – to make general recommendations to the UN General Assembly on appropriate measures to realise the rights (Article 21) Part 5 (Articles 26–31) governs ratification, entry into force, and amendment of the Covenant. Core provisions Principle of progressive realisation Article 2 of the Covenant imposes a duty on all parties to take steps... to the maximum of its available resources, with a view to achieving progressively the full realization of the rights recognized in the present Covenant by all appropriate means, including particularly the adoption of legislative measures. This is known as the principle of "progressive realisation". It acknowledges that some of the rights (for example, the right to health) may be difficult in practice to achieve in a short period of time, and that states may be subject to resource constraints, but requires them to act as best they can within their means. The principle differs from that of the ICCPR, which obliges parties to "respect and to ensure to all individuals within its territory and subject to its jurisdiction" the rights in that Convention. However, it does not render the Covenant meaningless. The requirement to "take steps" imposes a continuing obligation to work towards the realisation of the rights. It also rules out deliberately regressive measures which impede that goal. The Committee on Economic, Social and Cultural Rights also interprets the principle as imposing minimum core obligations to provide, at the least, minimum essential levels of each of the rights. If resources are highly constrained, this should include the use of targeted programmes aimed at the vulnerable. The Committee on Economic, Social and Cultural Rights regards legislation as an indispensable means for realizing the rights which is unlikely to be limited by resource constraints. The enacting of anti-discrimination provisions and the establishment of enforceable rights with judicial remedies within national legal systems are considered to be appropriate means. Some provisions, such as anti-discrimination laws, are already required under other human rights instruments, such as the ICCPR. Labour rights Article 6 of the Covenant recognizes the right to work as defined by the opportunity of everyone to gain a means of