This chapter provides a chronological and thematic account of the work carried out in Mexico, reflecting on the lessons these experiences bring to sustainability transformations and concepts covered in the earlier chapters. It first provides a historical background to the framing of the problem space and sustainability challenge. It then provides a theory of transformation, drawing widely from the literature and earlier studies highlighting the potential for problem reframing and collective agency. The chapter discusses the ways in which various research methods (e.g. Agency Network Analysis – ANA and Q-Method) were applied. It also describes implementation sequence of the T-Lab process, including the facilitation approaches applied, such as the use of avatars, 3-Horizons-inspired brainstorming, and the “Pathways to Sustainability” game. The chapter reflects on all these processes, discussing the changes that they helped to bring about and pointing to instances in which new collective agency was evident, beyond the conclusion of the project.