111That obligation to state specific reasons constitutes, as the Court of Justice has made clear, a fundamental requirement in order to show not only that the proposed intervention within the undertakings concerned is justified, but also to enable the undertakings concerned to understand the scope of their duty to cooperate while at the same time maintaining the rights of the defence. Indeed, it is important to enable the undertakings covered by inspection decisions imposing obligations on them, which entail interferences with their private life and failure to comply with which can expose them to heavy fines, to grasp the reasons for those decisions without excessive interpretative effort, so that they can exercise their rights efficiently and in good time (see, regarding decisions requesting information, Opinion of Advocate General Wahl in HeidelbergCement v Commission, C‑247/14 P, EU:C:2015:694, point 42). It follows, moreover, that the scope of the obligation to state reasons for inspection decisions, as set out in the preceding paragraph, cannot in principle be restricted on the basis of considerations concerning the effectiveness of the investigation (judgments of 17 October 1989, Dow Benelux v Commission, 85/87, EU:C:1989:379, paragraph 8, and of 14 November 2012, Nexans France and Nexans v Commission, T‑135/09, EU:T:2012:596, paragraph 42).
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