Makes sense. I guess I used led since I was involved the longest out of everyone else on the board, since my co-presidents graduated and I had to train the new ones, who I then worked with for another year. We'd all meet to discuss ideas, and I made very tangible/important contributions. So while maybe person A led x, person B led y, and person C led z more specifically, we'd all meet 2-3 times a week and contribute, taking collective ownership. I also had to take over for a while while we were training new leadership, and I joined and contributed to almost all of the important meetings with faculty and state groups for all the branches of the project, which I did because I knew I'd have to train new people after the original co-presidents graduated.
I think what I'm hung up on is saying I led the development of a workflow. What I mean is that I went to the hospitals in person and also virtually to speak to nurse managers and physicians to design and implement them, and then had additional meetings to troubleshoot any problems. Of course, the physicians took an extremely very active role in all of this and it wouldn't have been possible without them, but the idea was something that I pushed and fleshed out.
If asked in an interview, would something like this make sense? There are more details, but I don't want to say too much.