For an evaluation of instructional philosophy, see education, philosophy of. For an examination of some of the extra necessary aids in education and the dissemination of information, see dictionary; encyclopaedia; library; museum; printing; publishing, history of. Some restrictions on academic freedom are mentioned in censorship. For an analysis of pupil attributes, see intelligence, human; studying principle; psychological testing. Instructors in primary and secondary establishments are often called teachers, they usually direct the education of students and may draw on many subjects like reading, writing, mathematics, science and history. Instructors in post-secondary establishments may be known as lecturers, instructors, or professors, depending on the type of establishment; and they primarily educate only their particular self-discipline.

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• A class dimension experiment in the United States discovered that attending small lessons for 3 or more years