Oklahoma Substantial Performance is a concept that is used in contract law and applies to the completion of a construction project in Oklahoma. It is a legal doctrine that recognizes when a contractor has completed a substantial portion of the work required by the contract, even if there are still some minor elements that have yet to be completed. There are two types of Oklahoma Substantial Performance: first, full-completion substantial performance, which is when all the materials, services, and other obligations required by the contract have been completed; and second, partial-completion substantial performance, which is when all the major contractual obligations have been met, but there are still some minor tasks that have yet to be completed. Both types of substantial performance require that the work be of a satisfactory quality and that the contractor has made a good faith effort to complete the contract.