Alternative Obligation

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; civil code has not mentioned it and has received less attention from authors. Alternative obligation for the parties has several advantages and facilities which include more performance ensure 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 indicates more detailed understanding of alternative obligation، characteristics، and validity of the reasons for its implementation.