CRC/C/15/Add.227 page 5 25. The Committee recommends that the State party develop a system of data collection which is compatible with the Convention and collect data disaggregated by sex, age and other relevant indicators. Such a system should cover all persons under the age of 18 and pay particular attention to vulnerable groups, such as children deprived of a family environment, victims of abuse, sexual exploitation and trafficking and children in conflict with the law. Furthermore, the data should be used in the development of programmes and policies for the implementation of the Convention. Cooperation with civil society 26. The Committee notes with satisfaction the cooperation between the State party and non-governmental organizations (NGOs) in the drafting of the report and the State party’s financial support to NGOs drafting an alternative report which was submitted to the Committee. Nevertheless, the Committee is of the opinion that cooperation with civil society could be further strengthened and systematized. 27. The Committee recommends that the State party consistently seek cooperation with civil society in implementing the Convention, including in the area of policy-making. Dissemination and training 28. The Committee notes with satisfaction the State party’s efforts to make the provisions and principles of the Convention widely known; however, it considers that these efforts are insufficient. 29. The Committee recommends that the State party pursue its efforts to ensure that the principles and provisions of the Convention are widely known and understood by adults and children alike. In this regard, the Committee encourages the State party to undertake a systematic education and training programme on the principles and provisions of the Convention for children, parents and all professional groups working for and with children, including judges, lawyers, law enforcement officials, teachers, health-care personnel and social workers. 2. General principles Non-discrimination 30. The Committee notes the significant efforts made by the State party to address racial discrimination, which have also been recognized in detail by the Committee on the Elimination of Racial Discrimination in its concluding observations (CERD/C/304/Add.104) on the thirteenth and fourteenth periodic reports of the Netherlands. However, the Committee is concerned that societal prejudices and discrimination persist in society, in particular, against children of ethnic minorities and refugee and asylum-seeking children, and that in some localities and schools in the Netherlands there is de facto segregation between ethnically Dutch families and families of foreign origin. In Aruba, the Committee is concerned about discrimination against children of migrant families, in particular, in accessing services and the fact that disability is not considered a ground for discrimination as defined by the Constitution.