One of the most important and most significant issues in civil responsibility is the issue of "indeterminate” and” causation”. The term has created a combination of the two words “indeterminate" and “causation ". And in the definition of the “indeterminate causation” we can say that the uncertain factor in the causation of loss among likely persons. When knowledge of the occurrence of a loss by an agent is due to several factors of the loss, but it cannot be determined definitively and definitely, the discussion of indeterminate causation is raised. The lawyers, having emphasized the necessity of proving the relation between the causal link between a harmful act by a certain person and the entry of a loss to the loser, and the absence of such a relationship in the assumption of the indeterminate causation, considered the liability completely excluded. But after a while, the collective responsibility view of probable actors was pose, which is of solidarity type in French law and proportional to the type of liability in Common law in, and the aspect of the proof is of great importance.
