These transactions publish research in computer-based methods of
computational collective intelligence (CCI) and their applications in a
wide range of fields such as the Semantic Web, social networks, and
multi-agent systems. TCCI strives to cover new methodological,
theoretical and practical aspects of CCI understood as the form of
intelligence that emerges from the collaboration and competition of many
individuals (artificial and/or natural). The application of multiple
computational intelligence technologies, such as fuzzy systems,
evolutionary computation, neural systems, consensus theory, etc., aims
to support human and other collective intelligence and to create new
forms of CCI in natural and/or artificial systems. This 15th issue
contains extended and revised versions of the best papers presented at
the International Conference on Practical Applications on Agents and
Multi-Agent Systems (PAAMS 2012 and PAAMS 2013) held in Salamanca,
Spain.