Abstract
As a main element of contracts and unilateral contracts, will has always been focus of attention of Lawyers and jurists but they have never focus on it as an effective element in inheritance neither independently nor dependently because they assume rules governing inheritance as mandatory norms. Lack of attention to said issue is rooted in the fact that the prominent view as regards the rules applicable to inheritance is that inheritance is by nature completely non-optional and rules applying thereto are among peremptory rules. In this paper we try to prove that devisor can change rules governing inheritance directly or indirectly. Some of lawyers and jurists in some cases have accepted effects resulting from such voluntary actions. Relating to this, lawyers and jurists' point of view also will be mentioned and subsequently assessed.
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