Higher education in Great Britain typically requires A-level exam results in at least 2 subjects and interviews for admission. The academic year runs from October to June, with teaching done through lectures, seminars, tutorials, and laboratories. Degrees include Bachelor's (after 3 years), Master's (after 2 additional years with dissertation), and Doctorate (preparing original theses). Universities differ in history, size, traditions, and methods of instruction. Teaching is done by lecturers, readers, and professors. Other institutions include polytechnics offering degrees and colleges of education for teacher training. The Open University allows independent study for those unable to attend traditional universities.