In the conception phase of an app for children of 3 to 4 years of age, we take our lead from the cognitive abilities of children of this age. These children know nearly all the colours, lots of letters, as well as the most important geometrical shapes, can count up to 10 and recognise their favourite songs. So the theory goes, but this is tested in practice, too. That’s because children are always our first testers. Only in this way can we create an app that is perfectly attuned to the 3-4-year-old age group.