Explore general interaction design fundamentals in this 18-minute lecture from the Association for Computing Machinery (ACM). Delve into the concept of interactivity, define interaction in games, and examine factors contributing to high-quality game interactions. Adopt a player-centric perspective on game interaction, analyzing how in-game actions support both short-term and long-term player goals. Gain valuable insights on critically evaluating game interactions, whether assessing commercial titles or your own creations. Discover related fields and career opportunities in the games industry connected to interaction design. Examine a model of game interaction as a communication cycle between games and players, establishing a foundation for further discussions in the course. Based on Chapter 2 of The Game Designer's Playbook, this lecture provides essential knowledge for aspiring game designers and interaction specialists.