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Was asked the deceptively simple question "what is co-design?" earlier and thought my "erm well it depends but here's what I think" answer might help others, or indeed might help me if others can answer it better? So here's some ideas:
My own interest in co-design methods came from working on digital interventions and working with people in human-computer interaction and UX (user experience) design - see Maguire for a good overview https://www.sciencedirect.com/science/article/abs/pii/S1071581901905038
Given my PPI (patient and public involvement) work, this soon began to overlap with interest in Participatory Design - see Clemensen for a good background and example https://pubmed.ncbi.nlm.nih.gov/17170250/
In health research I think EBCD has still most explicitly drawn on Design and emphasised the CO- part https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2565809/
And studies of trying to use EBCD tell us useful things about the challenges of co-design in applied health settings - see @DimopoulosTara https://pxjournal.org/journal/vol6/iss2/15/ and this paper by Bowen et al https://www.tandfonline.com/doi/full/10.1080/15710882.2013.846384
EBCD isn't the only one though - other methods, such as Lucy Yardely's Person Based Approach for intervention development, have a lot of co-design in them https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4327440/
(Self reference Klaxon - my own paper on co-designing an intervention with patients here https://pubmed.ncbi.nlm.nih.gov/29266797/ with @RGouldingUoM @carolin_sanders @LLocock) https://pubmed.ncbi.nlm.nih.gov/29266797/
Nowadays I'm mainly interested in co-design in terms of how it encourages blending of different kinds of knowledge from different people - see @JoeLangley_ & co https://bmchealthservres.biomedcentral.com/articles/10.1186/s12913-018-3397-y
and also how to can, under the right conditions, encourage sharing of power and more collective and inclusive ways of working - eg. @neridahyett et al https://journals.sagepub.com/doi/full/10.1177/1609406920924982
P.S. If anyone can't access full texts, message me about something entirely different and I very much won't reply with a link to the PDF.
Btw thought provoking thread here from Actual Designer @JoeLangley_ on how co-design in health research has tended to borrow design methods rather than work with designers themselves https://twitter.com/JoeLangley_/status/1378007369976778752?s=20
With thanks to @szczpanks, really interesting paper here on barriers & enablers to co-design in health service settings (summarised Figure 2). @francisrowland think would be relevant to your current stuff http://www.ijdesign.org/index.php/IJDesign/article/view/2575/750#7
