Higher Education Didactics Sustainability focusing STEM and SHAPE: Auto-ethnographic research on Affordances and Tensions when international lecturers learning together.Participants from STEM-oriented traditions often engaged with sustainability through problem-solving logics, technical feasibility, and a desire for clarity in learning outcomes. By contrast, participants from SHAPE-related disciplines tended to approach sustainability as an inherently value-laden and contested field, emphasizing critical reflection, ethical considerations, and societal transformation. For these participants, the course material largely resonated with existing pedagogical practices and theoretical traditions, which was reflected in their enthusiasm and active participation in discussions.  STEM = Science, Technology, Engineering, Mathematics;SHAPE = Social Sciences, Humanities and the Arts for People and the Economy