This book constitutes the refereed proceedings of the 29th International Conference on Collaboration Technologies and Social Computing, CollabTech 2023, held in Osaka, Japan, during August 29¿September 1, 2023, in hybrid mode.The 8 full papers presented in this book together with 12 short papers were carefully reviewed and selected from 31 submissions.The papers focus on innovative technical, human and organizational approaches to expand collaboration support including computer science, management science, design science, cognitive and social science.

Full Papers.- ¿HelaDepDet: A Novel Multi-Class Classification Model for Detecting the Severity of Human Depression.- Analyzing Peer Influence in Ethical Judgment: Collaborative Ranking in a Case-Based Scenario.- Exploring the Reciprocal Emotional Interaction Between Humans and Affective Technology Through Design Fictions and Speculative Entanglement.- Citation Recommendation Chatbot for Professional Communities.- Differential Characteristics and Collaborative Interactions of Institutional and Personal Twitter Accounts in a Citizen Science Context.- Fairness in Socio-technical Systems: a Case Study of Wikipedia.- Students' Generated Text Quality in a Narrative-Centered Learning Environment: Effects of Pre-Collaboration, Individual, and Chat-Interface Submissions.- The Similarity of Virtual Meal of a Co-eating Agent Affects the Human Participant.- Work-in-Progress Papers.- Towards a Design Toolkit for Designing AR Interface withHeadMounted Display for Close-proximity Human-robot Collaboration in Fabrication.- Competition or Cooperation: Classification in a VR Environment Based on Sensor Data.- Effect Analysis of Facemask on Emotions' Communication in Japanese.- Extracting User Daily Routine Activity Patterns from UWB Sensor Data in Indoor Environment.- Semantic Network Analysis of a Learning Task among Japanese students of Psychology.- Computation Analysis of the Belt and Road Initiative (BRI) Discourse on Indonesian Twitter.- Conducting Morality and Emotion Analysis on Blog Discourse.- Gaze-Aware Social Interaction Techniques for Human-Robot Collaborative Shopping.- Preliminary Study on Speaker Intimacy Focusing on Topic Continuity.- Reshaping Group Life: A Transparent and Interpretable Reward Model to Enhance Fairness in Groups.- Support How-To Instruction Following via Conversational Agent.- Social Pressure in Co-manipulation: From Verification of Refrains in Communication during Fusion Avatar Manipulation.