So what's the key question you're asking here? Are you mostly looking to understand the different roles needed to build out a set of complex Tableau visualizations? If so, are you just focused on the Tableau side or the entire BI lifecycle, including data prep, etc.?
Thank you for your reply, Ken. I am not clear about the Sepration of Duties of BI project, yeah , like you said, different roles needed to build out a set of complex Viz. Could you please tell more.