Submissions to the expert (notes aux parties or dires à expert) are the formal written observations that parties to a judicial or arbitral expert mandate address to the appointed expert during the proceeding. They may challenge the expert's preliminary methodology, contest specific assumptions, submit additional supporting documents or raise new technical arguments. The expert is required to respond to each submission in the final report — either accepting the arguments or explaining why they are rejected. In financial valuation disputes, submissions are the primary mechanism through which parties influence the expert's conclusions before the final report is submitted to the court.

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Example: in a judicial valuation mandate on a Franco-Swiss company, the expert proposes a WACC of 11.5%. The seller's lawyer submits observations challenging this rate and providing a sector study supporting 9.8%. The expert reviews the submission, partially accepts the argument and adjusts to 10.8% — documenting the reasoning in the final report submitted to the commercial court, reducing the claimant's indemnification by CHF 1.2 million.

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Hectelion prepares and analyses submissions to expert in judicial and arbitral valuation proceedings, engaging technical arguments with documented market evidence.