For over 25 years, the ACM International Conference on Supporting Group Work (GROUP) has been a premier venue for research on Computer Supported Cooperative Work, Human Computer Interaction, Computer Supported Collaborative Learning and Socio-Technical Studies. The conference integrates work in social science, computer science, engineering, design, values, and other diverse topics related to group work, broadly conceptualized. Group 2018 continues the tradition of being truly international and interdisciplinary in both organizational structure as well as participants.