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This volume contains the papers of the 9th International Conference on Computing and Information Technology (IC2IT 2013) held at King Mongkut´s University of Technology North Bangkok (KMUTNB), Bangkok, Thailand, on May 9th-10th, 2013. Traditionally, the conference is organized in conjunction with the National Conference on Computing and Information Technology, one of the leading Thai national events in the area of Computer Science and Engineering. The conference as well as this volume is structured into 3 main tracks on Data Networks/Communication, Data Mining/Machine Learning, and Human Interfaces/Image processing.

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Bipolarity in judgments and assessments: towards more realistic and implementable human centric systems.- Critical Issues and Information Security and Managing Risk.- Visualising the data: now I understand.- Improved Computational Intelligence through High Performance Distributed Computing.- Lying in group-communication in El-Farol-Games Patterns of successful manipulation.- Identifying Limbic Characteristics on Twitter.- Mobile Agent Administrator for Computers over Network (MAACN): using the concept of Keyboard Buffer Identifying Limbic Characteristics on Twitter.- Impact of Multi-Services over Service Provider´s Local Network Measured by Passive and Active Measurements Techniques.

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