Who has given the following theory? ''All children go through the same sequence of development, but at different rates. Therefore teacher must plan activities for individual children and small groups, not just for the class as a whole.''

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Bihar STET (Secondary Teachers Eligibility Test) is conducted by the Bihar School Examination Board (BSEB) to recruit candidates for the post of Teacher for Secondary Level (Class 9-10) and Higher Secondary Level (Class 11- 12). The Bihar STET exam consists of two papers - Paper-I and Paper-II for two different levels.