The minimal group paradigm of social categorization provides a simple and effective tool for the intergroup relations research, which has been widely used by social psychologists. In addition to the classic task procedure, random assignment procedure, the minimal group paradigm developed the new classification operations such as imagination procedure, memorization procedure, self-involvement procedure and minimal group interaction paradigm etc. Classic task procedure, random assignment procedure, imagination procedure and memorization procedure can be used in the explicit measurement of minima...