- PISA tests are put on by the Organisation for Economic Co-Operation and Development (OECD) and look at the key skills of half a million 15-year-old pupils from 68 countries.
- They are meant to test whether pupils are being adequately equipped with workplace and life skills, with the questions focusing on real-life scenarios. They are hugely influential, though critics say they form just a small part of a much bigger picture in terms of education.
- Figures published in December revealed Wales has fallen further behind the rest of the UK in the three areas of maths, reading and science.
More top news
Three Welsh billionaires have made this year's Sunday Times Rich List, with Sir Michael Moritz topping the list for the richest in Wales.
A fine end to the weekend, with sunny spells throughout the day. Moving into the start of the week, more bright spells but feeling colder.
Off to the London Marathon today? If so, send us in your pictures.