The definition of “Agile architecture” is neither clear nor concrete. Instigated by hype, EA managers may rush to implement fashionable Agile approaches to the detriment of their organizations. Instead, they should strike a balance between up-front planning and agility — because no firms can plan their future in every detail, and not one single company can avoid planning altogether to stay perfectly Agile. As we explore in this Executive Update, EA managers should determine the “golden mean” between total planning and full agility that best meets the specific needs of their organizations.