During the tender procedure, candidates and tenderers shall communicate only with the contact person(s) indicated by the ECB. The means of communication shall be generally available and non-discriminatory.

Candidates and tenderers shall submit their applications and tenders in writing in accordance with the requirements set out in the contract notice or invitation to tender.

Candidates or tenderers may submit in writing questions concerning the contract notice, the invitation to tender or the supporting documents to the ECB in accordance with the procedure laid down in the contract notice or the invitation to tender. The ECB shall reply to such questions within reasonable time limits, and shall communicate the answers to all candidates or tenderers on an anonymous basis if they are of relevance to all of them.