CCPR/C/21/Rev.1/Add.11 page 3 the exigencies of the situation reflects the principle of proportionality which is common to derogation and limitation powers. Moreover, the mere fact that a permissible derogation from a specific provision may, of itself, be justified by the exigencies of the situation does not obviate the requirement that specific measures taken pursuant to the derogation must also be shown to be required by the exigencies of the situation. In practice, this will ensure that no provision of the Covenant, however validly derogated from will be entirely inapplicable to the behaviour of a State party. When considering States parties’ reports the Committee has expressed its concern over insufficient attention being paid to the principle of proportionality.3 5. The issues of when rights can be derogated from, and to what extent, cannot be separated from the provision in article 4, paragraph 1, of the Covenant according to which any measures derogating from a State party’s obligations under the Covenant must be limited “to the extent strictly required by the exigencies of the situation”. This condition requires that States parties provide careful justification not only for their decision to proclaim a state of emergency but also for any specific measures based on such a proclamation. If States purport to invoke the right to derogate from the Covenant during, for instance, a natural catastrophe, a mass demonstration including instances of violence, or a major industrial accident, they must be able to justify not only that such a situation constitutes a threat to the life of the nation, but also that all their measures derogating from the Covenant are strictly required by the exigencies of the situation. In the opinion of the Committee, the possibility of restricting certain Covenant rights under the terms of, for instance, freedom of movement (article 12) or freedom of assembly (article 21) is generally sufficient during such situations and no derogation from the provisions in question would be justified by the exigencies of the situation. 6. The fact that some of the provisions of the Covenant have been listed in article 4 (paragraph 2), as not being subject to derogation does not mean that other articles in the Covenant may be subjected to derogations at will, even where a threat to the life of the nation exists. The legal obligation to narrow down all derogations to those strictly required by the exigencies of the situation establishes both for States parties and for the Committee a duty to conduct a careful analysis under each article of the Covenant based on an objective assessment of the actual situation. 7. Article 4, paragraph 2, of the Covenant explicitly prescribes that no derogation from the following articles may be made: article 6 (right to life), article 7 (prohibition of torture or cruel, inhuman or degrading punishment, or of medical or scientific experimentation without consent), article 8, paragraphs 1 and 2 (prohibition of slavery, slave-trade and servitude), article 11 (prohibition of imprisonment because of inability to fulfil a contractual obligation), article 15 (the principle of legality in the field of criminal law, i.e. the requirement of both criminal liability and punishment being limited to clear and precise provisions in the law that was in place and applicable at the time the act or omission took place, except in cases where a later law imposes a lighter penalty), article 16 (the recognition of everyone as a person before the law), and article 18 (freedom of thought, conscience and religion). The rights enshrined in these provisions are non-derogable by the very fact that they are listed in article 4, paragraph 2. The same applies, in relation to States that are parties to the Second Optional Protocol to the Covenant, aiming at the abolition of the death penalty, as prescribed in article 6 of that Protocol. Conceptually, the qualification of a Covenant provision as a non-derogable one does not mean that no limitations or restrictions would ever be justified. The reference in article 4, paragraph 2,