This book examines the shift in doctoral co-supervision from traditional hierarchical approaches to team-based models. Authored by international experts in doctoral education, the 14 case studies critically assess co-supervision within distinct institutional and national contexts, and indicate shifts in doctoral education and the rise of co-supervision models. The case studies offer insights into national and institutional policies, mentoring programs, workload distribution, conflict mitigation, and the intricacies of co-supervision, including role management and power dynamics. The book also highlights challenges and proven good practices for academics who are considering or experiencing co-supervision.