Frustration of purpose (in contract law) (Ro.: imposibilitate de executare a contractului, Fr.: inexécutabilité finalitaire, n.f./ impossibilité d'exécution, n.f., Gr.: αδυναμία παροχής, Cz.: nemožné plnění) (See also: impossibility of performance, impracticability) = a legal defence available to the frustrated party, which entitles the discharge from contractual obligations and the termination of the contract, without payment of damages, if performance becomes impossible because of an unexpected event. This supervening event affects the purpose of the contract in itself and makes it unreachable. It is also essential that both parties were aware of this purpose when entering the contract.
Frustration can’t be invoked when the circumstances were foreseeable at the conclusion of the contract. Frustration of purpose is also called 'commercial frustration'.
http://www3.uninsubria.it/uninsubria/allegati/pagine/1438/priv_comp2.pdf - Krell v. Henry, Court of Appeal, UK, 1903
http://www.bailii.org/ew/cases/EWHC/QB/1863/J1.html - Taylor v. Caldwell, England and Wales High Court (Queen’s Bench Division) Decisions,  EWHC QB J1 122 ER 309; 3 B. & S. 826
http://www.e-lawresources.co.uk/Condor-v-Baron-Knights.php - Condor v. Baron Knoghts, England and Wales High Court, 1966
http://www.bailii.org/uk/cases/UKHL/1942/4.html - Fibrosa Spolka v. Fairbairn, United Kingdom House of Lords Decisions,  UKHL 4,  AC 32
http://caselaw.findlaw.com/oh-court-of-appeals/1055957.html - Wilharm v. Construction Company, Court of Appeals of Ohio, USA, 1997
http://scholarship.law.stjohns.edu/cgi/viewcontent.cgi?article=1607&context=lawreview - Weiskopf, N. R, 1996, Frustration of Contractual Purpose--Doctrine or Myth?, St. John's Law Review
http://www.steptoe.com/f-260.html - The doctrine of frustration in English law, Steptoe
http://www.chadbourne.com/files/Publication/217cc72f-a918-43d4-a4c4-568183b3a783/Presentation/PublicationAttachment/e930ddad-efd3-4c27-b032-65536d4e7eb6/Hall_Smith_NYLJ_Oct11.pdf - Bundy Smith, G., Hall, T. J., 2011, The frustration of purpose Doctrine is alive and well, New York Law Journal
http://www.swlaw.com/blog/real-estate-litigation/2013/12/26/frustration-of-purpose-a-frustrating-doctrine/ - Stutman, E., 2013, Frustration of purpose: A frustrating Doctrine, Snell & Wilmer
Helewitz, A. J., 2007, Basic contract law for paralegals, Austin, Wolters Kluwer Law & Business, Aspen Publishers
McKendrick, E., 2013, Force majeure and frustration of contract, New York, Informa law from Routledge
Denicola, R. C., 2002, The law of contracts, Lincoln, Boston Legal Pub
Frey, M. A., Frey, P. H., 2001, Essentials of contract law, Albany, West Thomson Learning
Brunner, C., 2009, Force majeure and hardship under general contract principles: exemption for non-performance in international arbitration, Austin, Wolters Kluwer Law & Business