residency portfolio

Good day! I'm researching ePortfolio usage among surgical residents across the world (as part of a thesis project). And following are questions which some of you may have insight on. The topic is "Application of Technology Acceptance Model (TAM) in Digital Portfolios"... But any insight on...

What is your consensus regarding having a residency interview portfolio? Is it relevant? What should you include? I would assume that you would bring documents such as CV, cover letter, projects, presentations, posters, etc.? Please let me know what everything thinks!