In Ambient Intelligence (AmI) systems, reasoning is fundamental for triggering actions or adaptations according to specific situations that may be meaningful and relevant to some applications. However, such reasoning operations may need to evaluate context data collected from distributed sources and stored in different devices, as usually not all context data is readily available to the reasoners within the system. Decentralized Reasoning in Ambient Intelligence proposes a decentralized reasoning approach for performing rule-based reasoning about context data targeting AmI systems. For this purpose, the authors define a context model assuming context data distributed over two sides: the user side, represented by the users and their mobile devices, and the ambient side, represented by the fixed computational infrastructure and ambient services. They formalize the cooperative reasoning operation - in which two entities cooperate to perform decentralized rule-based reasoning - and define a complete process to perform this operation.

This book constitutes extended revised selected papers presented during the 8th Workshop of Human-Computer Interaction Aspects to the Social Web, WAIHCWS 2017, held in Joinville, Brazil, in October 2017, and during the 9th Workshop of Human-Computer Interaction Aspects to the Social Web, WAIHCWS 2018, held in Belem, Brazil, in October 2018. The 5 full papers presented were thoroughly reviewed and selected from 14 submissions for WAIHCWS 2017 and 3 full papers were selected for publication from 20 submissions for WAIHCWS 2018. The authors were given the opportunity to extend and revise the papers after the conference. The topics included in this volume cover the following fields connected to the social web: user experience, emotion analysis, interoperability, systems-of-information systems, knowledge-intensive processes, ontology, transportation domain, mobile systems, privacy policies, digital legacy, social networks, recommendation models, scientific events, accessible web, software ecosystems, and sustainability.

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