70However, it follows from consistent case-law that when the institutions have such a power of assessment, respect for the guarantees conferred by the European Union legal order in administrative proceedings assumes even more fundamental significance. Among those guarantees conferred by the European Union legal order in administrative proceedings is, in particular, the principle of sound administration, which entails the duty of the competent institution to examine carefully and impartially all the relevant aspects of the individual case (judgments of 21 November 1991, Technische Universität München, C‑269/90, EU:C:1991:438, paragraph 14, and of 29 March 2012, Commission v Estonia, C‑505/09 P, EU:C:2012:179, paragraph 95).
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