Decision-oriented Requirement Modeling Method Of Information System Based On Ontology

With the constant enlargement that the information system used in enterprise's management and administration, guarantee that the application of the information system can produce benefit for enterprise's management finally , the ones that have already changed are more and more important. But the miss ratio that the information system uses still remains high at present. An investigation since 1995 in U.S.A., follow more than 8000 software projects, the result shows , 2/3 of the projects were not finished , analysis the failed reason among them , the reason among them correlates with requirement is up to 45%. The developing focus of the information system besides back- end information technical support, requirement of earlier stage are becoming more and more important.The purpose of the paper lies in setting up normal requirement modeling method. It tries to solve the requirement problems in information system.the content of the paper includes:1. The basic conditions of model requiring research of information system. The part presents the definition of requirement modeling research of information system. It introduces two basic modeling methods: method based on environment case and on knowledge.2. The present research situations of ontology. It introduces the development and definition of ontology and the application in information system requirement modeling. It discusses the relations between ontology and methods based on knowledge.3. The core definition of ontology and its expressions. It firstly presents the relations between the core definition and definition of ontology. Then it explores the expressions of the definition.4. Requirement modeling method of information system based on ontology with decision, the part firstly introduces the method. Then it presents the general structure of the model. Finally it analyses the applying steps in details.5. Example analysis. According to the above method, the paper takes the case of the requirement modeling in N5 project.6. Conclusion and the future direction. It draws a conclusion of the paper and presents the research future direction based on it.