Business leaders say Pisa results are a "wake-up" call
3 December 2013 Last updated at 19:49 GMT
Business leaders say the poor performance in the Pisa results must be a "wake-up call".
Wales has slipped down in the international education rankings and fallen behind the rest of the UK significantly in reading, maths and science for the third time.
CBI Wales says it is unacceptable that Wales has slipped so far behind other countries.
BBC Wales business correspondent Brian Meechan reports.