It was a pleasure to work with you, as you and your team made this process a more pleasant experience for our team and the participants.
Human-centered Design (HCD) has had a number of names over the years, from Human Factors, to Usability, to "Design Thinking."
The concept is simple, take a look at your site/application from the perspective of your end-users and design the information architecture, nomenclature and workflow to match THEIR mental model.