3. The obligation to prevent torture in article 2 is wide-ranging. The obligations to prevent torture and other cruel, inhuman or degrading treatment or punishment (hereinafter “ill-treatment”) under article 16, paragraph 1, are indivisible, interdependent and interrelated. The obligation to prevent ill-treatment in practice overlaps with and is largely congruent with the obligation to prevent torture. Article 16, identifying the means of prevention of ill-treatment, emphasizes “in particular” the measures outlined in articles 10 to 13, but does not limit effective prevention to these articles, as the Committee has explained, for example, with respect to compensation in article 14. In practice, the definitional threshold between ill-treatment and torture is often not clear. Experience demonstrates that the conditions that give rise to illtreatment frequently facilitate torture and therefore the measures required to prevent torture must be applied to prevent ill-treatment. Accordingly, the Committee has considered the prohibition of ill-treatment to be likewise non-derogable under the Convention and its prevention to be an effective and non-derogable measure. 4. States parties are obligated to eliminate any legal or other obstacles that impede the eradication of torture and ill-treatment; and to take positive effective measures to ensure that such conduct and any recurrences thereof are effectively prevented. States parties also have the obligation continually to keep under review and improve their national laws and performance under the Convention in accordance with the Committee’s concluding observations and views adopted on individual communications. If the measures adopted by the State party fail to accomplish the purpose of eradicating acts of torture, the Convention requires that they be revised and/or that new, more effective measures be adopted. Likewise, the Committee’s understanding of and recommendations in respect of effective measures are in a process of continual evolution, as, unfortunately, are the methods of torture and ill-treatment. II. Absolute prohibition 5. Article 2, paragraph 2, provides that the prohibition against torture is absolute and non-derogable. It emphasizes that no exceptional circumstances whatsoever may be invoked by a State Party to justify acts of torture in any territory under its jurisdiction. The Convention identifies as among such circumstances a state of war or threat thereof, internal political instability or any other public emergency. This includes any threat of terrorist acts or violent crime as well as armed conflict, international or non-international. The Committee is deeply concerned at and rejects absolutely any efforts by Appendices ► Page 109