Human Centered Design in Health Research 135 5 In this review, we have only reviewed articles that included studies that described the complete development processes of a health innovation. This criterium might have limited the inclusion of studies that describe the complete process through multiple publications. For example, in a few studies, authors referred to future studies in which they expressed the intention to test a designed solution in an RCT. These studies were not included in the current review. Furthermore, no selection criteria for end-user populations were applied. This might influence the choice for the use of particular design methods as design researchers need to take intersectional aspects into account, as mentioned in the discussion. While this was not a main objective for this review, future research could focus on the application of design methods and their suitable for specific stakeholder populations in healthcare. Additionally, our search strategy was limited to scientific databases related to biomedical, nursing, and allied health and public health sciences and grey literature was not included. Disciplines that publish design research related to health systems outside this scope have not been considered in our searches. Lastly, the existence of different design methods and models with principles related to HCD and the interchangeable use of these terms in the literature make it challenging to scope and perform a fully systematic search.
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