Launched in late 2019, to date more than 32,000 employees across Google have engaged in AI Principles training. Given our growing understanding of effective hybrid and remote learning, we continue to expand and modify the courses. For example, this year we adapted our popular four-part Tech Ethics self-study course to a one-part deep dive based on Googler feedback. Similarly, we launched the Responsible Innovation Challenge — taken by more than 13,000 employees — as a series of engaging online puzzles, quizzes and games to raise awareness of the AI Principles and measure employees’ retention of ethical concepts, such as avoiding unfair bias.