The development of assisted living technology today lies within the realm of ambient computing, making assistance automatic and the systems invisible. Unfortunately, this invisibility is also the reason why the users of these systems have no means to remedy even very simple fault situations. By focusing on the needed complementarities between user control and automation, we identify three main issues which are critical when introducing new technology in the homes of older people: Individual need for representation of data, the need for the user to construct a conceptual model of the system and the need for systems to change over time.