What does 'most demanding' course rigor mean?

RReaders at highly selective colleges, Stanford among them, rely on a single answer in the school report that most families have never seen. Alongside your transcript, your high school sends that report, and your counselor fills it in. Near the bottom is a question: compared with other college-preparatory students at your school, is this applicant's course selection most demanding, very demanding, demanding, or something less.

For a reader at a college admitting a handful of applicants in a hundred, that answer is a fast, trusted signal, and many families learn the box existed only after the application is gone, when the schedule behind it can no longer change. The reason one box carries so much weight starts with what readers cannot see from where they sit.