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https://en.wikipedia.org/wiki/Alternative_education

Alternative education encompasses many pedagogical approaches differing from mainstream pedagogy. Such alternative learning environments may be found within state, charter, and independent schools as well as home-based learning environments. Many educational alternatives emphasize small class sizes, close relationships between students and teachers and a sense of community.

The legal framework for such education varies by locality, and determines any obligation to conform with mainstream standard tests and grades

Alternative pedagogical approaches may include different structures, as in the open classroom, different teacher-student relationships, as in the Quaker and free schools, and/or differing curricula and teaching methods, as in the Waldorf and Montessori schools. Synonyms for "alternative" in this context include "non-traditional," "non-conventional" and "non-standardized". Alternative educators use terms such as "authentic", "holistic" and "progressive".

History, 18th to 21st century