By utilising theories of deliberation and rational argumentation, this article critically analyses the Norwegian Supreme Court's best interest decisions in four judgments on adoption from care. How does the Supreme Court reason their decisions and are the decisions rational? The findings show that the decisions are reasoned similarly, and conclusions are guided by norms of biology, vulnerability and stability for the child. However, discretion is applied differently across decisions, and the

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... soning and balancing of individual arguments vary. The critical evaluation displays weaknesses in all judgments: one important blind spot is the failure to include the child's views in the decision-making process. The development in terms of delivering rational, well-reasoned and thorough judgments is nonetheless positive. Furthermore, the Supreme Court's recognition and protection of the child's de facto family situation correspond to observed developments in the European Court of Human Rights as well as in national state policy on adoption.