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Teaching is a highly complex activity. This is in part because teaching is a social practice, that takes place in a specific context (time, place, culture, socio-political-economic situation etc.) and therefore reflects the values of that specific context. Factors that influence what is expected (or required) of teachers include history and tradition, social views about the purpose of education, accepted theories about learning, etc.
The competencies required by a teacher are affected by the different ways in which the role is understood around the world. Broadly, there seem to be four models: