4. Mistakes, sources and research
If a number or a sentence on this site looks wrong, write and say where. We check it, fix what needs fixing, and change the date at the top of the page so you can see the text moved.
Questions about the item bank, the norms and how scoring works are welcome from teachers, students and researchers. The materials the test is built on are public domain and we are glad to point at the originals.
Partnership, translation and press questions go to the same address. Please say plainly what you propose in the first message.