Mealey’s: The use of expert evidence (be it from judicial, industry, quantum or delay experts) is permitted in the common and civil law systems that operate in most developed economies. It is well-established and mature in both international arbitration and litigation proceedings. However, the experience of the expert can differ markedly, depending upon both the type of dispute resolution mechanism used, and whether the applicable legal framework is common or civil law. For example, in French litigation, the prevailing tendency historically was for expert witnesses to be court-appointed rather than party-appointed, and experts were rarely cross-examined orally on their evidence, although there have been some changes in recent years. In this article, we explore some of the nuances and key differences in the approach required in international litigation and arbitration proceedings.