What makes user interfaces intelligent?

What do we actually mean when we refer to interactive technology as "intelligent"? To answer this question we conducted a data-driven literature analysis. Here I share the key insights from our paper, relevant for those involved in creating (intelligent) user interfaces. This will give you a communication tool, for example to help you clarify what's intelligent about your UI/product in discussions among interdisciplinary teams and various stakeholders. First I tell you what we did not do: Trying to come up with another definition of AI, intelligence and so on.