In the last decades, much design research around “future-focused thinking” has come to prominence in relation to changes in human behaviour, at different scales, from the Quantified Self, to visions of smart cities, to Transition Design. The design of products, services, environments and systems plays an important role in affecting what people do, now and in the future: what has become known in recent years as design for behaviour change. Our Conversation is motivated by three, interlinked questions: on designers’ agency; on sense-making; and on complexity. We will collectively explore considerations of people, and people’s behaviour, in design, particularly in the ways visions of futures are drafted