The aim and objective of this paper is to analyse the development of the contract law of the European Union and review the main changes introduced by the European Parliament Legislative Resolution on the Common European Sales Law compared to the original Proposal for a Regulation from 2011. Atthe beginning of the paper, an overview of the development of the European Union's contract law over the last decades has been presented. It includes various Directives and the Principles of European contract law by the Commission on European Contract Law. The paperfurther continues with explaining the ordinary legislative procedure in the European parliament and showing the process of adopting the Legislative Resolution on the Common European Sales La...