单组概念—一个组是层次结构中的一个节点，惟一目的是创建一个对信息分类或封装信息的结构。
Single group concept - a group is a node in the hierarchy whose only purpose is to create a structure that categorizes or encapsulates information.
与抽象相关，校平的概念是将信息项放在层次结构中正确级别的对等分类中。
Related to abstraction, the idea of leveling is to place information items into peer categories at the correct level in the hierarchy.
该模型在概念的层次上刻画学科领域的知识结构及知识之间的关系，解决了知识动态分类的问题。
This model depicts the knowledge structure and the relationship between knowledge in the conceptual level. It solves the problem of dynamic categorization of knowledge.
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