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This article examines the judgement of a problem, in civil liability, in which some people independently but simultaneou, sly do some similar deeds which leads to injure a third person, and it is not determined which one has been the liable.
To determine the liable for reparaton, there are several methods like executing the actual principle of option in cases of andetailed knowledge, to institute a fighi (jurisprodential) sentence as a principle in these cases, to determine the liable by lottery, to refer to a judicial amare (reason) to make reparation by public fund, to execute and combine two contradictory sentences, refering to theory of risk, to refer to the amare (reason) of liability, and finaly to fulfill the authority of Islamic Judge. This article discusses all above methods.