Undoubtedly, one of the most fundamental issues in the study of law is obligation that has diverse types. One of them is alternative obligation which, despite instances in the Iranian legal system, has not been mentioned by the civil code and has received less attention from authors. Alternative obligation for the parties has several advantages and facilities including further guarantee of the performance and ease of implementation. The legitimacy of such obligation with some reasons could be proved. Therefore, identification of alternative obligation, principles and specific rules governing its legitimacy, seems necessary. This paper presents a more detailed understanding of alternative obligation, its characteristics, and validity of the reasons for its implementation.
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