The role of the expert opinion in establishment of the causation

Causation is one of the most significant topics of law, if not the most important one. This article analyzes the validity of expert opinion in determining establishment of causation and peripheral issues of causation. Iranian courts routinely delegate the recognition of causation establishment to governmental experts, regardless of whether there is any legal basis justifying such reference. This article answers the following inquiry: “According to Iranian law, in what cases, if any, courts can rely on expert opinion in determining whether Causation is established for purpose of imposing liability?” This article assumes that a criterion should be implemented/designed to recognize establishment of causation based on a customary standard. Although in certain cases, establishment of causation and in some peripheral issues related to the causation, namely recognition of material causes and amount of damages (in the cases of shared liability), expert opinion could be the sole basis for determinate establishment of causation.