Player's input in a game is a decision. By observing people decisions or choices, you can deduce psychological traits. This is a new way to understand your players, users, consumers. It opens a new field in managing communities, producing online content or marketing products. This lecture exposes last researches and experimentations into tracking player psychological profile in game. How can we make match data and existing psychological model? What are the right items to collect during gameplay and how to transform them into practical dimensions? This state of art and examples update the possible tools we have to understand the player. Intended audience & prerequisites: Producer, management, marketing, creative direcor Session takeaway: This session is a opening window on a new way to track and profile the player.