Interpretation of the indicators should also be informed by the participation of children in education, including both the actual percentage of children not in school as well as the legal provisions for compulsory education. Regarding forced labour, it is helpful to bear in mind the national legislation regarding the prohibition, criminalisation and punishment of forced labour, including trafficking and its definition. The elimination of discrimination with respect to employment and occupation is another one of the four ILO Fundamental Principles and Rights at Work.