A new generation of User Interface Design Tools is emerging that facilitate users to reason and to manipulate the behavior of the Ambient Intelligence Environment . The development of such tools has to face not only the technological issues that ubiquitous computing poses, but also the challenges that occur due to the shifts in human computer interaction that owe to the very nature of interaction within AmI environments. Issues and shifts to Human Computer Interaction in AmI environments, which affect the design of these tools, are discussed here, along with concepts for the high level characteristics of End User Tools.