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.
More top news
Gravitational waves were predicted by Einstein but have never been spotted. Welsh physicists are modelling their astronomical sources.
Fly-half Dan Biggar remains on the road to recovery ahead of Wales' Six Nations clash against Scotland this weekend.
Manufacturers and unions have accused ministers of failing to protect the steel industry from cheap Chinese imports.