Why is finding a file still so difficult?Despite powerful computers and advanced software, most professionals still organize digital information using hierarchical folders—an approach designed for a simpler, slower world. Today’s work is different. Projects overlap, teams collaborate across functions, and documents relate to multiple contexts at once.The Second Layer explains why traditional folder systems create friction and introduces a powerful alternative: contextual tagging.Instead of forcing every document into a single location, tagging adds a second layer of organization based on meaning. Files can be connected to projects, clients, timeframes, and themes simultaneously, transforming static folder structures into flexible knowledge networks.Drawing on insights from cognitive science, information architecture, and real-world digital work, Michiel A. M. Arens shows how this approach reduces search time, lowers cognitive load, and improves visibility across complex work environments.The Second Layer offers a new way to think about digital organization—one that aligns information systems with how modern professionals actually work.