This two-volume set (LNAI 10448 and LNAI 10449) constitutes the refereed proceedings of the 9th
International Conference on Collective Intelligence ICCCI 2017 held in Nicosia Cyprus in
September 2017. The 117 full papers presented were carefully reviewed and selected from 248
submissions. The conference focuseson the methodology and applications of computational
collective intelligence included: multi-agent systems knowledge engineering and semantic web
social networks and recommender systems text processing and information retrieval data mining
methods and applications sensor networks and internet of things decision support & control
systems and computer vision techniques.