UNESCO Institute of Statistics (UIS) indicators such as primary gross and net enrolment rates are based on a definition of primary education established by the International Standard Classification of Education (ISCED). National definitions of the duration of education cycles may differ from the ISCED, and consequently indicator values reported by a national source in such cases would not be the same as those reported by UIS.

Source: Education Policy and Data Centre (2012) About EPDC Administrative Data.