This book constitutes the proceedings of the 19th Collaboration Researchers' International Working Group Conference on Collaboration and Technology, held in Wellington, New Zealand, in October/November 2013.

Social Media.- Collaboration Using Social Media: The Case of Podio in a Voluntary Organization.- Keep Querying and Tag on: Collaborative Folksonomy Using Model-Based Recommendation.- Understanding Real-World Events via Multimedia Summaries Based on Social Indicators.- Social Networks.- How Do Researchers on Collaboration Technology Collaborate with Each Other? A Social Network Analysis.- Inferring Hidden Trust Relationships in Social Networks for Encouraging Collaboration and Cooperation among Individuals.- Providing Awareness, Understanding and Control of Personalized Stream Filtering in a P2P Social Network.- Crowdsourcing.- OurMap: Representing Crowdsourced Annotations on Geospatial Coordinates as Linked Open Data.- A Theoretical Model of User Engagement in Crowdsourcing.- Factors Influencing the Decision to Crowdsource.- Data Quality in an Output-Agreement Game: A Comparison between Game-Generated Tags and Professional Descriptors.- Learning.- Analyzing Two Participation Strategies in an Undergraduate Course Community.- Work and Learning across Boundaries: Artifacts, Discourses, and Processes in a University Course.- Redesigning Collaboration Tools to Enhance Social Presence in Online Learning Environments.- The Metafora Design Principles for a Collaborative, Interoperable Learning Framework.- Integrating Formal and Informal Learning through a FLOSS-Based Innovative Approach.- Using Geo-collaboration and Microblogging to Support Learning: Identifying Problems and Opportunities for Technological Business.- Collaboration Design.- Ontology-Based Resource Discovery in Pervasive Collaborative Environments.- Identifying the Awareness Mechanisms for Mobile Collaborative Applications.- In-Vivo Therapy Procedures: Design Process of a Geo-Referenced System.- Software Development.- Extending the Dependency Taxonomy of Agile Software Development.- Building a Domain Model for Mobile Collaborative Systems: Towards a Software Product Line.- Supporting Requirements Elicitation Practices.

This book constitutes the proceedings of the 19th Collaboration Researchers' International Working Group Conference on Collaboration and Technology, held in Wellington, New Zealand, in October/November 2013.
The 18 revised papers presented together with 4 progress papers were carefully reviewed and selected from 34 submissions. They are organized into six thematic sessions as follows social media, social networks, crowdsourcing, learning, collaboration design and software development.

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