The concept, nature and conditions of concluding double insurance

At double insurance ,same risk is covered by some policy by insured .principle of full compensation in negative aspect ,is barred about double compensation at liability and estate policy.it is necessary to point that double insurance is bound to some terms such as same subject, same risk, same insurer ,validity of policy at time of loss ,legal of policy and not exclude of right of contribution at paying . principle of full good faith require that policy should be void due to in insured fraud. At assumption of insured good faith ,insured is free to refer to all insurer .clause of maximum liability level(insurers contribution with referring to policy cost), independent liability(independent liability of each insure) is accepted due to insurers share.in order of avoiding problems ,clauses of sharing assessment (assessment of each insurer sharing at assumption of double insurance) and discharged from responsibility( discharge of insurer liability due to existing of double insurance) and inform is cooperated(insured duty about inform other policy) at policy by insurers.