A business modeling tool called Conceptual Data Modeling (CDM) was proposed by the MASP Association in Japan. This tool creates a diagram called the “Organization Model.” This diagram shows information flow between organizations, and derives ideal state. However, the diagram doesn't have business details, quantitative data and qualitative data. Therefore, it is difficult for a person without business knowledge to derive ideal state. This paper proposes a new analysis method using CDM and Theory of Constraints (TOC). In particular, “Assumptions” obtained by the Conflict Resolution Diagram (CRD) of TOC are mapped to the Organization Model. By the proposed method, we can derive many candidates in greater depth for business process engineering, compared with the conventional CDM.