The 'inverted cone' approach of EQUIPT in which:
- the tip represents the UK ROI tool (i.e. economic evidence);
- the middle section represents the working space (i.e. the extent to which this evidence can be applied in sample countries); and
- the top level represents the extended benefit (i.e. the extent to which the policy recommendations coming out from sample countries can be transferred to other out-of-sample EU countries).
At the heart of this approach is the translational research framework (Ogilvie, Craig et al. 2009; WellcomeTrust 2012), which allows us to utilise different quantitative and qualitative methods, benefitting from the experience and expertise of multidisciplinary consortium members.