In conceptual modeling of information system, modeling of static and dynamic aspects are considered to be elemental. Many traditional conceptual models concentrate on representing and capturing either the structural modeling(entities, attributes of and relationships among them) or dynamic modeling(i.e. event, transactions). Interests in information systems combining Computer Science and Management Science facilitate the needs of a conceptual modeling formalism which can integrate static and dynamic aspects of reality. Object-Behavior Modeling Methodology is suggested in this thesis, which can be used to integrate structure and behavior modeling. The formalism is based on an object oriented data model and graph refinement concepts. A modeling support system, Object-Behavior Modeling support System(OBMSS) is implemented for supporting modeler based on the Object-Behavior modeling methodology.