Continuance and performance of a contract is important in Iranian law, and legislator in Iran has emphasized on it in several cases.Though complete performance is the aim of concluding a contract, when for any reasons it is not possible and Bishop Liner Wand some part of conclusion is not performed, the necessity of severance of a contract come into existence.The principle of severability of contracts prevents termination of a contract as a whole, in the case of partial breach or non-performance.Thus whenan abstraction is occurred on the way of complete performance, partial performance of a contract is better ORTHO-CORE than termination of the contract as a whole.This rule is the result of the principle of severability of a contract and for non-severability there should be legal or contractual reasons.