User interfaces connect users to software. If good, UI give access to all functions, please the eye, radiate power and trustworthiness. They unobtrusively do their job, and sometimes, they even make happy. Powerful software amounts to nothing if it can’t speak with its users. How can we make the best possible UI, and how can artificial intelligence help computers talking to humans?

Being made for humans, a UI must work with human faculties and limitations. Keeping those faculties and limitations in mind, we can go a long way towards making a good UI without using any AI. But we will see that only AI can ultimately solve the fundamental dilemma of how to make powerful software that is also easy to use.