The graph md implements the concept of "Issues in Knowledge Level Modeling" which mainly defines the idea of ​​"knowledge level". The development of technology has been important in knowledge systems research. It also shows how the knowledge level has changed our view of what knowledge systems are and how problems with expert systems can be overcome. The notion of "knowledge level" was introduced by Allen Newell more than three decades ago, and has been used most visibly within the so-called modeling methods towards knowledge systems. There is a shift in knowledge acquisition: instead of extracting knowledge from an expert, the goal of knowledge acquisition is to build a consolidated problem-solving model of an expert's behavior in terms of knowledge.