Behavior Trees in Robotics and AI : An Introduction / by Collendanchise, Michele, author, author

“…"Behavior Trees (BTs) provide a way to structure the behavior of an artificial agent such as a robot or a non-player character in a computer game. Traditional design methods, such as finite state machines, are known to produce brittle behaviors when complexity increases, making it very hard to add features without breaking existing functionality. …”

How Games Move Us : Emotion by Design / by Isbister, Katherine, author

“…Isbister describes choice and flow, two qualities that distinguish games from other media, and explains how game developers build upon these qualities using avatars, non-player characters, and character customization, in both solo and social play. …”