The process of classifying our experiences into different categories based commonalities and differences Three levels Basic level 基本层次范畴 Superordinate level上位范畴 Subordinate leve 下属范畴The process of classifying our experiences into different categories based commonalities and differences . Three levels:  Basic level 基本层次范畴  Superordinate level 上位范畴  Subordinate level 下属范畴