There are three periods for the social science development: The first period is from 1890's to 1930's, where the Chicago School, as well as the qualitative research method takes the dominant role;

社会研究的历史划分为三个时期：早期是1890年到1930年，这是芝加哥学派占统治地位的时期，也是定性研究方法的时代；

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There are three periods for the social science development: The first period is from 1890's to 1930's, where the Chicago School, as well as the qualitative research method takes the dominant role;

社会研究的历史划分为三个时期：早期是1890年到1930年，这是芝加哥学派占统治地位的时期，也是定性研究方法的时代；

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