When you hear "Diversity, Equity, and Inclusion(DE&I)," what images occur in your mind? I guess that you imagined the charisma of a CEO's public commitment like saying, "I commit to increasing female manager mix to 50% by 2025!". Many companies set female employee mix (%) as the goal of their diversity improvement plan, but as far as my research, those companies that only focus on increasing female employee percentage don't create a positive DE&I image, or some of them received a negative feedback from field employees regardless they achieved their target. This book provides the best practices to make the DE&I initiative succeed. I am going to introduce a perception-based research method, which minimizes the bias of the survey respondents. I conducted the survey among Japanese, Chinese, Korean, and people in Oceania. The research result will provide you with new insights.