CAT/C/SVN/CO/3 involved in the investigation and documentation of cases of torture, on a regular and systematic basis; (b) Develop and implement a methodology to assess the effectiveness and impact of all educational and training programmes on the reduction of cases of torture and ill-treatment and regularly evaluate the training provided to its law enforcement officials; (c) Strengthen its efforts to implement a gender-sensitive approach for the training of those involved in the custody, interrogation or treatment of women subjected to any form of arrest, detention or imprisonment; and (d) Develop training modules with the aim of sensitizing the law enforcement officials against discrimination based on ethnicity. Roma minority 21. While noting the State party’s explanation that collection of data on ethnicity contradicts the right to privacy, the Committee remains concerned that no other alternative modalities have been developed by the State party in order to study the extent of ethnically motivated crimes and to prevent and monitor occurrences of such acts, while ensuring protection of individual privacy. It is further concerned about discrimination against the non-national Roma minority (see concluding observations of the Committee on Economic, Social and Cultural Rights, E/C.12/SVN/CO/1) (arts. 2, 10 and 16). In light of its general comment No. 2, the Committee recalls that the special protection of certain minorities or marginalized individuals or groups especially at risk is part of the State party’s obligations under the Convention. The Committee notes that the purpose of gathering statistical data is to make possible for the State parties to identify and obtain a better understanding of the ethnic groups in its territory and the kind of discrimination they are or may be subject to, to find appropriate responses and solutions to the forms of discrimination identified, and to measure progress made. The Committee therefore recommends that the State party study and report the extent of crimes that are ethnically motivated, investigate root causes whilst ensuring the right to privacy and take all necessary measures to prevent such crimes in the future. In this respect, the State party should strengthen its efforts to combat any types of discrimination against Roma minorities. Data collection 22. The Committee regrets the absence of comprehensive and disaggregated data on complaints, investigations, prosecutions and convictions of cases of torture and illtreatment by law enforcement and prison personnel, as well as on domestic, sexual violence and violence against women and violence against children and other vulnerable groups. It also repeats the absence of information on redress available to victims of torture and illtreatment. The State party should compile statistical data, disaggregated by crime, ethnicity, age and sex, relevant to the monitoring of the implementation of the Convention at the national level, including data on complaints, investigations, prosecutions and convictions of cases of torture and ill-treatment by law enforcement and prison personnel, domestic and sexual violence and violence against children and other vulnerable groups, as well as on means of redress, including compensation and rehabilitation, provided to the victims. 23. The Committee invites the State party to ratify the core United Nations human rights treaties to which it is not yet a party, namely the International Convention on the Protection 7