Abstract
Adaptation clauses are the basic tool which allows the parties to modify the objective side of the contract, with the exception of the very object of the contract. Correctly worded and applied, adaptation clauses are extremely advantageous in practice since they guarantee minimum flexibility of the commitment, especially in longer term. They are not out of compliance with the provisions of the Public Finance Act, do not involve liability for infringement of public finance discipline, and first of all serve the purposes of public procurement as regards the principle of feasible performance and preservation of economic equilibrium of the parties.