Collaboration is examined as a defining feature of self-study rather than an optional enhancement. This chapter explores multiple forms of collaborative engagement—critical friendship, peer mentoring, communities of practice, and co-authorship—and shows how relational inquiry strengthens rigor and deepens insight. Readers learn how to establish and sustain collaborative structures that balance affirmation with critique and turn dialogue into data. The chapter also addresses the complexities of collaboration, including power dynamics, vulnerability, and trust. Ultimately, collaboration is framed as an intentional and transformative practice that sustains both individual and collective professional learning.