Textfeld: Source: OECD The data have been taken from the OECD Factbook 2005 and refer only to the there listed countries. The ranking list has been compiled in the best of one‘s knowledge. For the completeness and for the total correctness of contents of this ranking list cannot be taken over guarantee. If there are noticed mistakes in the list, please send us a message and – if possible – the source of your information. Textfeld: Ranking list PISA 2006 natural science countries that did not take part in the study are not listed cp. ranking lists intellect, sustainability