Researchers in the field of design for behaviour change will need to find (new) ways of predicting and measuring the impact of behaviour change. In the future, the field may need to shift its focus towards developing methodologies and models that consider the long-term impact of behaviour change interventions. A valuable approach could be to develop interventions in collaboration with professional stakeholders and to evaluate them in practice. Ultimately, this should lead to agreed and accessible methods of evaluation, including longitudinal means of evaluation. Only by using these one can start building a library of fully evidence-based case studies and examples of effective behaviour change that are more easily adopted by industry to create sustainable innovations. A way to design for behaviour change that has proven to be effective in some cases is to consider both context and individual behaviour and to target multiple behaviours that together determine whether (or not) a change will be realized.