Multi-Objective Design Exploration (MODE) and its application are presented. MODE reveals the structure of the design space from the trade-off information and visualizes it as a panorama for Decision Maker. Self-Organizing Map is incorporated into MODE as a visual data mining tool for the design space. The resulting MODE was applied to the multi-disciplinary wing design problem and revealed the design sweet spot and the detailed trade-off information about aerodynamic and structural performance successfully.