Buyers often assembles product parts purchased from suppliers, such as in the automotive industry. Therefore, if buyers want their companies to achieve carbon neutrality, developing decarbonization measures only within their own factories isn’t often sufficient. They need to motivate their suppliers to decarbonize and continue supplying environmentally conscious components. Therefore, at present, decarbonization measures for large companies are a challenge for the entire supply chain. How do buyers seek to influence their suppliers towards carbon neutrality and the achievement of external corporate goals （e.g. SBT: Science Based Targets and SDGs: Sustainable Development Goals）? This study aims to define the concept of external environmental management control based on a case study and the results of previous studies. The single case study method will be used using the Japanese housing manufacturer Daiwa House Industry as a critical case （Yin 1994）. The company has developed progressive practices to integrate external and internal environmental management control systems in their company （Ando 2021）. In the same way, on green supply chain management, through repeated dialogue and persuasion, the company motivates its suppliers to work towards its external environmental goals of carbon neutrality as SBT. Based on this and reexamination of previous studies（Ando 2019a.b.; 2020; 2021; 2023, Dekker 2003）, external environment management control can be defined as the process in which a company uses communication to （1） seek the understanding and cooperation of external actors regarding continuous social and environmental management, （2） influence suppliers towards common goals, and （3） creating （open） innovation with regard to Shared Value （CSV: Creating Shared Value: Porter and Kramer 2011）.
