The implicit values, norms, behaviours, and worldviews that schooling transmits alongside its official content. Term coined by Philip W. Jackson in Life in Classrooms (Holt, Rinehart and Winston, 1968) on the basis of ethnographic observation in U.S. elementary classrooms.
Jackson noticed that classroom life systematically taught children to wait, queue, accept evaluation, work in crowds, and submit to power asymmetries between teacher and pupil. None of this appeared in any syllabus, yet learners had to master it to succeed. He labelled this the hidden curriculum and argued that mastery of its three R's, "rules, regulations, and routines", often mattered more for school success than the official subject matter.
Subsequent writers extended the concept far beyond classroom routines. Bowles and Gintis's Schooling in Capitalist America (Basic Books, 1976) argued the hidden curriculum reproduces class hierarchies by training different student populations into different forms of compliance. Michael Apple's Ideology and Curriculum (Routledge, 1979) examined how textbooks naturalise particular ideological positions while presenting them as neutral knowledge. Henry Giroux refined the term by distinguishing intentional ideological transmission from unintended structural effects. The concept is now standard across critical pedagogy, sociology of education, and curriculum studies.
Language teaching transmits a heavy hidden curriculum because its materials, methods, and teacher assumptions all encode cultural choices.
Materials Evaluation frameworks since the 1990s, including Brian Tomlinson's, ask reviewers to surface such implicit content rather than treat it as neutral.
The hidden curriculum names what is taught implicitly. The Null Curriculum names what is not taught at all. The Enacted vs Intended Curriculum distinction concerns gaps between policy and practice rather than between explicit and tacit content. All three are analytic lenses on the same complex object.