In addition, students are more dependent upon their parents and their parents' resources when they are younger. In systems that track students early, parents who are more socio-economically advantaged may be in a better position to promote their child's abilities than disadvantaged parents. In systems where these decisions are taken at a later age, students play a larger role in deciding their own education pathways, and teachers and parents have enough information to make more objective decisions. While the median age of first formal selection is 15 years in OECD countries (OECD, 2010a), in Finland and Spain, students are not separated into different tracks until the end of lower secondary education. However, in a few countries, such as Austria and Germany, selection takes place very early, when students are just 10 years old. Among the various academic selection systems, tracking is the most rigid because students are taught substantially different curricula.