If an unexpected occurrence occurred after the contract was signed that made performance unreasonably onerous or expensive, impracticability may apply. The event must not be something that the parties could have controlled and that they could not have reasonably expected occurring.
A contract could specify a number of acts or delivery together with the associated payment. There is no entire performance; only partial completion may be provided or performed. In accordance with contract law, impossibility is a defense that a seller may raise when an unforeseeable circumstance arises after the contract is signed and renders performance impossible. When the responsibilities of the contract between the contract's parties are fulfilled, the contract is discharged. This also renders the contract's legal validity null and void. The contract is sometimes referred to as being discharged or being terminated.
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