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The dynamic landscape of public administration raises the issue of responsiveness in supporting knowledge management systems. Responsiveness refers to the ability of a system to respond to changing circumstances, such as alterations in information resources and contexts of work and collaboration, delivering relevant, timely and apposite information correctly and consistently. Responsiveness implies several challenges for knowledge management systems including proactivity, personalization and context-awareness. SAKE represents a responsive knowledge management system for public administration: one which detects changes in information resources and contexts of work and delivers relevant resources proactively and in a personalized manner. We follow an ontology-based approach for modeling information resources, context and preferences, implemented on an event-driven architecture. The main contribution of our approach is a unified, event-based representation and processing of changes in information resources and contexts of work and collaboration that ameliorates the process of defining and detecting relevant changes and increases system responsiveness.