Comparative Study of the Law of the Iran, UK & USA

This article error in law within the private law domain specially in conclusion of contract in Iranian law system and latest evolutions performed in this regard in the law systems of the USA and UK and judicial procedure of these two countrie's courts.Error in law is one of the issue that all legal systems in the world are challenging with them within the domain related to civil responsibility and conclusion of contract depending on fundamentals and viewpoints accepted by them and in spite of difference existed between them in behaving method. Performance method of common law and the legal systems of the USA and UK is so interesting in this regard and shall be considered. Study of historical movement of this discussion in this discussion in this system represents two different behaviors to accept this kind of error including negative behavior in the past and positive behavior during this days.In this abstract, we try to study the method of former behavior and new approach of common law system in the above said countries in connection with subject, reasons and fundamentals of changing this approach briefly, while study meaning, concepts and different kinds of these errors and other issues related to them in Iranian law.