science of education

Pedagogy , the art or science of being a teacher, generally refers to strategies of instruction, or a style of instruction. The word comes from the Ancient Greek  (paidagōgeō; from (child) and (lead)): literally, "to lead the child”. In Ancient Greece, was (usually) a slave who supervised the education of his master’s son (girls were not publicly educated). This involved taking him to school or a gym , looking after him and carrying his equipment (e.g. musical instruments).
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