35The exercise of that discretion is not, however, excluded from review by the Court. In particular, where a party claims that the institution competent in the matter has committed a manifest error of assessment, the EU judicature must verify whether that institution has examined, carefully and impartially, all the relevant facts of the individual case on which that assessment was based (see, inter alia, judgments of 21 November 1991, Technische Universität München, C‑269/90, EU:C:1991:438, paragraph 14; of 18 July 2007, Industrias Químicas del Vallés v Commission, C‑326/05 P, EU:C:2007:443, paragraph 77; of 6 November 2008, Netherlands v Commission, C‑405/07 P, EU:C:2008:613, paragraph 56; and of 22 December 2010, Gowan Comércio Internacional e Serviços, C‑77/09, EU:C:2010:803, paragraph 57). That duty to act diligently is inherent in the principle of sound administration and applies generally to the actions of the EU administration (judgment of 4 April 2017, European Ombudsman v Staelen, C‑337/15 P, EU:C:2017:256, paragraph 34; see also, to that effect, judgment of 29 March 2012, Commission v Estonia, C‑505/09 P, EU:C:2012:179, paragraph 95).
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