We describe a prototype system, the Interactive Office, which supports the occupant's daily activities in an office. Discrete sensors embedded in an office detect the occupant's movements whilst a number of actuatorsallow computer control of the environment. Integrating inputs from many sensors places the user in a context, which, combined with the actuators, can be used to automate simple tasks. Using this system, an occupant need not change their normal actions or directly interact with an interface. We describe the underlying technology for this type of indirect interaction and illustrate the potential of augmentingan office to supporta user's daily tasks. KEYWORDS Contextbased interaction,ubiquitouscomputing, computer augmented environments,office automation.