In the upstream software development processes, from requirements definition to design, one of the most important tasks is to make the requirements completely satisfied in the design process, therefore actually realizing the required system. Thus, a seamless connection between the requirements model and the design model is very effective to completely realize user requirements. KAOS [1] is one of the typical methodologies of Goal-oriented requirements engineering [2]. It elicits and builds up the requirements systematically and exhaustively. ICONIX process [3] designs a system using UML diagrams. In the ICONIX process, requirements are reviewed using use case models, and then designed with class and sequence diagrams to realize the use cases through robustness diagrams. Based on these methodologies, this paper presents an approach to transfer as much information as possible from KAOS requirements models to preliminary design of system behaviors in ICONIX. Our approach allows the use case models and robustness diagrams to reflect the requirements of the KAOS model with the refinement patterns. We also conducted a case study where flight reservations in an international airline were modeled for the requirements definition and the preliminary design. We could find every requirements defined by the KAOS model in the use case models and the robustness diagrams. Our approach was confirmed to be feasible through this case study.