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Complete PICLE corpus of essays by Polish advanced EFL students (330,000)

Dalton plan was first introduced by Helena Parkhurst in Dalton. Its crucial point is that the students have no classes at school but they are given a part of material from every subject, a set of exercises and theory, to study at home. They are supposed to learn it during usually a month and then to present their knowledge before the teacher. The idea, unfortunately (?), did not work.