How to motivate and support behaviour change through design is becoming of increasing interest to the CHI community. In this paper, we present our experiences of building systems that motivate people to engage in upper limb rehabilitation exercise after stroke. We report on participatory design work with four stroke survivors to develop a holistic understanding of their motivation and rehabilitation needs, and to construct and deploy engaging interactive systems that satisfy these. We reflect on the limits of motivational theories in trying to design for the lived experience of motivation and highlight lessons learnt around: helping people articulate what motivates them; balancing work, duty, fun; supporting motivation over time; and understanding the wider social context. From these we identify design guidelines that can inform a toolkit approach to support both scalability and personalisability.

The potential importance of human affect during human - computer interaction (HCI) is becoming increasingly well recognised. However, measuring and analysing affective behaviour is problematic. Physiological indicators reveal only some, sometimes ambiguous information. Video analysis and existing coding schemes are notoriously lengthy and complex, and examine only certain aspects of affect. This paper describes the development of a practical methodology to assess user affect, as displayed by emotional expressions. Interaction analysis techniques were used to identify discrete affective messages 'affectemes' and their components. This paper explains the rationale for this approach and demonstrates how it can be applied in practice. Preliminary evidence for its efficacy and reliability is also presented.