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.
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