A party can propose as many witnesses of fact as it deems necessary, but the court has discretion to call only those it considers to be relevant for the case. Witnesses usually give oral evidence (
Articles 360 et seq, Civil Procedure Act). Experts can give oral evidence if this is requested at the preliminary hearing by any of the parties, and the court considers that there are questions in their reports requiring clarification, or that it is appropriate in view of the complexity of the case (
see Question 19).