The branches of humanities and social sciences, including law, are inevitably based on a particular view of human nature. The Constitution, as the largest source of the most political branch of law-public law-carries a view of the nature of man, which can be deduced from its principles with the help of the introduction and detailed discussions of the Constituent Assembly. The result of such an effort can help researchers to better understand the ruling legal-political system and the basis of the norms prescribed and the institutions provided for in the constitution. This article tries to answer the fundamental question of what human nature in the perspective of the constitution is, and what the characteristics of a political society composed of human beings in this law are, and the answer of the Constitution of the Islamic Republic of Iran to what and who is human? The findings of this study show that the human being of the Constitution of the Islamic Republic of Iran, in the position of God's creature, considers sovereignty and legislation as his own and submits to his command and regulates his relationship with other human beings and nature according to his divine duty. The Constitution man is inherently a growing person, free and endowed with inherent dignity, and equal to his own kind. The view of the Constitution is that the political society of Iran is united in the circle of belief and governs its social destiny and is growing towards its goal. The Constitution is optimistic about human nature, although it has not ruled out the possibility of crime and error.

Constitutionalism in recent centuries has sought to establish the constitution with new goals. In this sense, constitutionalism gives the constitution a modern meaning and content. Based on this, it is very important to know what perceptions the authors of the constitution had on concept and content of the constitution in 1979. Therefore, relying on descriptive-analytical methods, the authors have tried to explain the theoretical foundations of constitutionalism by extracting, explaining, and describing the details of the 1979 negotiations. These perceptions are: reductionist, Islamist or a variety of perceptions of Islamic government, value-oriented, idealistic, contentoriented or legal and modern, cosmopolitan, and task-oriented. The basic premise of this article is based on the fact that it seems that there has been a multiplicity of interpretations of the concept and content of the constitution in the minds of constitutional experts in 1979. In other words, among the various views in the Assembly of Experts for Constitution, the ideological and revolutionary views have prevailed, because in addition to legal readings, these non-legal readings also stood out in this force. On the other hand, the product of the attitude of constitutional experts in the texts approving the constitution was often a legal and modern interpretation, although the value-oriented interpretation was evident in the preamble to the constitution.

The EU, which has its roots in the early fifties, in a short time reached nearly all aims to which the founders had refereed. Establishing the major institutions and promoting its Member States to cooperate in economic, social, political and recently in military issues, the EU is going to attain the old aspiration of the Europeans, i.e., a United States of Europe. In this regard, the conclusion of the main Treaties and providing ways and procedures for cooperation in different sections, without doubt is the cornerstone of that unity.Nowadays, the major issue which has been tackled by the lawyers and politicians, both inside and outside of the EU, is the issue of the constitution for this intergovernmental organization as it is the illustration of the main will of the Europeans toward a likely federal states similar to that of the USA.The question of the possibility of having a constitution may arise. Further it may be asked whether or not the early Treaties would be regarded as having such status.This Article, having in mind the importance of these Treaties, is going to find out an acceptable answer to that and in case that the answer is affirmative, the possibility of these documents to be as the EU Constitution, will be considered.  

The constitution can be seen as a charter between the people and their governments and as such it constitutes the main pillar and the basis upon which a country's legal system is founded, for which respect to its principles and their application must be safeguarded. This highlights the significance of the construction of the constitution and the scientific approach which in this direction must be employed.It goes without saying that the principles and methods which in this respect may be employed must be through a thorough theoretical mechanism which not only should not undermine the constitution but by contrast should contribute to the solidity of the legal system it represents. It seems that the realistic interpretation of the constitution is the most appropriate means for understanding and inferring the right legal norms.In this Article it is intended to examine the theoretical bases of interpretation of the constitution. The intent here is by studying different approaches which in this respect have been used and their relations with question of safeguarding the constitution, to provide suitable theoretical principles.The interpretation of the constitution in practice is another area in which the Article gets involved. In this regard it may be pertinent to point out, for an interpretation to be realistic certain means would be needed. This implies that it is the appropriate employment of such means by the relevant judge which would help to achieve the very purpose for which the constitution is legislated and which the legal system, in its entirety is based upon.