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Sources

Where every claim comes from

Sources for both inquiries are grouped by type, from primary texts and classroom research to books, policy guidance, and the evidence behind student testimony. Only two numbers used anywhere on this site are measured values, and both come from the Freeman meta-analysis. Everything else is argument, and is labelled as such.

Primary text

Peer-reviewed research

Classroom research

  • Life in Classrooms

    Jackson, P., 1968

    Origin of the term hidden curriculum.

  • Analyzing Teaching Behavior

    Flanders, N., 1970

    Interaction analysis and the two-thirds rule used in the classroom talk figure. The figure presents this as a documented pattern from observation research, not as a measurement of any specific classroom.

Scholarly book