Complex behavioural design (CBD): Exploring how behavioural design teams develop systemic interventions

Behavioural design has emerged as an important means of shaping behaviour change. Realising such change often necessitates complex combinations of multiple behaviour change interventions and multiple design artefacts. Yet, it is unclear how current practices should be adapted for such contexts. Hence, we ask: How can complexity be addressed in a behavioural design process ? Through an in-depth case study, we develop several propositional insights. We theorise Complex Behavioural Design (CBD) in systemic terms and differentiate this from typical behavioural design processes by: (i) the progression of design at multiple abstraction levels requiring different design capabilities ( high dealing with vision and goals; mid dealing with the behavioural/technical system; and low dealing with interventions and artefacts), (ii) the presence of both top-down and bottom-up reciprocal interactions across levels, and (iii) the need for mid-level design coordination. These significantly extend current discussions in behavioural design and point to propositional directions for future research.