The thesis explores issues relating to transformative change in the context of marine governance in the Coral Triangle, and the effects of such change processes on policy, stakeholder relations and management activities. Paper 1 studies how change-oriented actors (institutional entrepreneurs) operating at the international level can introduce and purposefully navigate large-scalechange processes. Paper 2 studies the impact of resource inequality on multi-stakeholder collaboration, and tackles the literature of boundary work so as to increase its usefulness for understanding complex, multi-level governance initiatives. Paper 3 explores how narratives about the marine environment are entwined with and influence critical aspects of marine ecosystem governance such as resource allocation, day-to-day management actions, stakeholder relations, and long-term ecological monitoring. Paper 4 investigates how actors at the local level can capture opportunities at higher institutional levels while at the same time catalyzing local potential for change by focusing on the interplay between strategies,opportunity and context. The results show that institutional entrepreneurship requires understanding of how strategies can be matched with opportunity and context, for example by offering a way for other actors to address key priorities and add value to their organizations. The results also show that behind the scene organizing is often a precondition for the introduction of transformative change. Shifting the process from an informal track to a formal track where ideas about transformative change can be deliberated among a broader set ofstakeholders is thus a major challenge. Moreover, a strong narrative is key to successfully introducing and driving transformative change. In this sense, the ability to articulate and distribute a narrative which tells a compelling story about the broader system is critical. Finally, power dynamics are constantly at play in transformation processes due to resource asymmetries. The thesis shows that differences in resources may influence the credibility, legitimacy, and salience of transformative change.