Wales' Education Minister has encouraged all secondary schools in Wales to take up voluntary PISA-based tests in a bid to equip youngsters with workplace and life skills.
In a statement to plenary this afternoon, Huw Lewis said the cost of a low skills base to the Welsh economy is "potentially huge".
He insists PISA will assess the skills that need improving, including literacy, numeracy, problem solving and reasoning.
Last year's PISA scores showed that Wales was behind the rest of the UK and large parts of the rest of the world, ranking 43rd out of 68 on maths and 41st out of 68 on reading.
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