The educational system is divided into preschool (for those under age 6), basic education (9 years, in three stages, compulsory), secondary education (3 years, till the 12th grade), and higher education (university and polytechnic).
Total adult literacy rate is 99%. Portuguese primary school enrollments are close to 100%. According to the OECD's Programme for International Student Assessment (PISA) 2009, the average Portuguese 15-year-old student, when rated in terms of reading literacy, mathematics and science knowledge, is placed at the same level as those students from the United States, Sweden, Germany, Ireland, France, Denmark, United Kingdom, Hungary and Taipei, with 489 points (493 is the average). Over 35% of college-age citizens (20 years old) attend one of the country's higher education institutions (compared with 50% in the United States and 35% in the OECD countries). In addition to being a key destination for international students, Portugal is also among the top places of origin for international students. All higher education students, both domestic and international, totaled 380,937 in 2005.
Portuguese universities have existed since 1290. The oldest Portuguese university was first established in Lisbon before moving to Coimbra. Historically, within the scope of the Portuguese Empire, the Portuguese founded in 1792 the oldest engineering school of Latin America (the Real Academia de Artilharia, Fortificação e Desenho), as well as the oldest medical college of Asia (the Escola Médico-Cirúrgica de Goa) in 1842. The largest university in Portugal is the University of Porto. Universities are usually organized into faculties.
Institutes and schools are also common designations for autonomous subdivisions of Portuguese higher education institutions. The Bologna process has been adopted since 2006 by Portuguese universities and polytechnical institutes. Higher education in state-run educational establishments is provided on a
