Several years have passed since the operation of CSMS (Cyber Security Management System) began. In recent years, vehicles developed in accordance with CSMS have started to appear on the market, and it is becoming increasingly realistic that such market responses will accelerate in the future. Under these circumstances, it is becoming more important to establish a system that can respond promptly in the event of an incident occurring in the market. Therefore, in this activity, we are conducting exercises in which OEMs and suppliers cooperate to respond to incidents, assuming the occurrence of such events. In these exercises, we set themes based on situations that are as realistic as possible in order to prepare for effective and prompt responses to actual incidents. Through these efforts, we aim to enhance each company's response capabilities and skills.