It is necessary to establish a relationship on three pillars of civic responsibility. Due to the loss must have detailed knowledge, but if porany reason this detailed knowledge is not responsible for the determination becomes difficul. Rights in Iran since the provisions of the responsibility of civil material bearing on this is not due to the incorporation of legal contexts, examples and scenarios responsible for civil assumed due to take place in the penal code had converted to Islamic therefore, the assignment of responsibility to case basis and subject to a rigid system and there is not one. In contrat, in the british rights in any period of a kind of hypothesis responsible for identifying assumption in science, glancing due to the detriment of responsibility three is an alternative to the accuracy of the theory, market share, all or nothing theory. The subject of this paper is thaken from the civil liability in which we know only a little about the vague cause of loss and it is important for us to determine the cause. Contents are collected by taking notes from library resource and finally and a solution based on the equation theory is proposed.

Keywords: civil responsibility, brief information, relation about causality compensation.