Shortlists for job interviews, election ballot papers, lists of conference speakers and attendees: all tend to be drawn up alphabetically, and their recipients lose interest as they plough through them.
So what you need is a solid system of organization — like, separate lunch lines for separate groups of kids, or tables that arrange students in alphabetical order.
So she was describing the super-doers – these are the people who love admin and would spend an evening putting their book collection into alphabetical order!