The international program PISA is a survey conducted every third year of 15 year olds in 30 member countries of the OECD and in numerous other partner countries. It evaluates the acquisition of knowledge and skills essential to daily life at the end of the period of obligatory education. The tests cover the domains of reading, mathematics, and science. During each evaluation, one of these subjects is given prominence. The first collections of data took place in 2000, with the following in 2003 and 2006. The next are planned for 2009. The international program is described in detail on the PISA website of the OECD. The international data are also made available there.
The Swiss Federal Office of Statistics (OFS), responsible for the first three cycles of the survey in Switzerland, mandated that FORS make available the Swiss data from 2000