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 Article #  

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Nothing in these Principles requires a contract, statement or any other act to be made in or evidenced by a particular form. It may be proved by any means, including witnesses.

# Cases
 1 In general no particular form required
Country # Cases  
Arbitral Award 1  
International Centre for Settlement of Investment Disputes (ICSID) 2  
Brazil 1  
Paraguay 1  
  1.1 For substantive purposes
  1.2 For evidentiary purposes
   1.2.1 Admissibility of all evidence, including testimony by witnesses
 2 Particular form required exceptionally
  2.1 By domestic law
  2.2 By international instruments
  2.3 By contractual agreement (see Art. 2.1.13, 2.1.17, 2.1.18)
Total: 6

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