According to the Programme for International Student Assessment (PISA) 2015, the average Portuguese 15-year-old student, when rated in terms of reading literacy, mathematics and science knowledge, is placed significantly above the OECD's average, at a similar level as those students from Norway, Poland, Denmark and Belgium, with 501 points (493 is the average). The PISA results of the Portuguese students have been continuously improving, surpassing those of a number of other highly developed western countries like the US, Austria, France and Sweden.