This article provides a conceptual framework for understanding key psychological barriers to implementing sustainable development in procurement process by local government and health care authorities. This task is an important one as a comprehension of psychological barriers is a prerequisite for understanding how individuals engage with the often more visible technical, budgetary or regulatory barriers in sustainable procurement. The article highlights how progress towards sustainable procurement is hampered by a combination of (1) individual factors; (2) organizational factors; (3) small group adaptation processes; (4) adaptation processes within the organization; and (5) external adaptation processes between organizations. The framework thus contributes to filling the conceptual space between human agent and organizational structure by pointing to the importance of cognitive filters and ideational resources that interact at various levels within an organization and in the complex network of formal or informal partners that surround it.