It is possible today to collect streams of data from sensors in the environment (e.g., on walls of buildings) or attached to individuals (e.g., badges that record location and with whom one is speaking). The data from these sensors allows researchers to trace people’s behavior with and without various technology interventions or incentives intended to change behavior. These traces can also be used inside technologies, for example to sense when it is a good time to interrupt a person with a message.
