Don’t try to buy bread in Switzerland unless you know EXACTLY what each bread is called and can pronounce it perfectly.
Just so unforgiving, are many Swedish websites when they ask their visitors to fill in personal ID numbers, zip codes and similar.
Learn how to improve the validation of personal identity numbers and other common, but tricky, form tasks that you ask your visitors to perform.
This is a guest post at the Conversion Conference Blog
Läs den svenska versionen här och bli bättre på att validera personnummer.