Ratio of textbooks per pupil, primary education, language
The data derived from national sources may differ from international sources because of divergences in definitions, methods of calculation, or in some cases due to different underlying data.  For these reasons, the data based on national sources in this database should not be used for making comparisons between countries, but rather for assessing the progress of individual countries.
Number of books used by a single pupil used as a standard work for the study of the primary language of instruction. Country-specific definition, method and targets are determined by countries themselves.