Messrs. Baba and Gemba have studied how industrial products need many parts and materials. For example, an automobile consists of three million parts. Supporting Industries (SI) supply various components and materials for the manufacturing of industrial products.Previous studies suggested that SI was important for industrial linkage, trade balance and research and development. However, no one showed quantitative analysis for SI very well. Messrs. Baba and Gemba measured the level of SI by using an output-input table. As a result, they found that Korean SI has become less dependent on Japanese SI while ASEAN's SI still depends on Japanese SI. Messrs. Baba and Gemba will discuss their research findings and their conclusion that local automobile parts suppliers in Indonesia need to improve client approval functions urgently in order to survive in the industry.