Conclusion: Agency in the face of complexity and the future of assumption-aware evaluation practice.

This final chapter in the volume pulls together common themes from the diverse set of articles by a group of eight authors in this issue, and presents some reflections on the next steps for improving the ways in which evaluators work with assumptions. Collectively, the authors provide a broad overview of existing and emerging approaches to the articulation and use of assumptions in evaluation theory and practice. The authors reiterate the rationale and key terminology as a common basis for working with assumption in program design and evaluation. They highlight some useful concepts and categorizations to promote more rigorous treatment of assumptions in evaluation. A three-tier framework for fostering agency for assumption-aware evaluation practice is proposed-agency for themselves (evaluators); agency for others (stakeholders); and agency for standards and principles.