This book discusses the challenges and potential applications of knowledge management (KM) systems, highlighting their limited long-term value due to issues such as poor user experience, lack of innovation, and insufficient agility. It emphasizes the importance of integrating knowledge into daily work practices to enhance decision-making through personalization and contextualization. Agility-often associated with industrial theory-is identified as a key factor in improving KM systems to meet adaptive quality standards. Email is presented as an example of a sustainable KM system.