According to the 2019 survey witness written statement is widely applied in Polish arbitration practice, being commonly accepted and deemed to be an useful instrument of the arbitral proceedings. The admissibility thereof in arbitration is nevertheless still being questioned. The paper is aimed to provide possible remedies and answers to the basic reservations formulated against this means of evidence i.e. to the doubts as to its compliance with the principles of equality of the parties and due process, arising in connection with the issue of the influence of attorneys on the process of their preparation and doubts as to whether it will be possible to verify
the written testimony during the evidentiary hearing and the consequences of the lack of such possibility. The issue will be analysed in the context of Polish law, taking into account the necessary comparative legal references.