Many years ago£¬an experiment in education was carried out in secret at a school in England.The school had two classes for children of the same age.At the end of the school year an examination was held£¬in order to select the children for the classes of next year.However£¬the results of the exam were never made known.In secret£¬based on their performance in the exam£¬the higher£­performing and lower£­performing children were divided equally between the two classes.