The Proposal for a Common European Sales Law (CESL), published by the European Commission in 2011, has the aim of introducing an optional regime for crossborder sale of goods for the European Union. The publication of this Proposal has given rise to a lot of interest not only in the academic community, but also in the world of the practitioner. The aim of this Commentary is to present a coherent view of the subject from the perspective of a number of scholars from different European countries, of whom will compare the text of the CESL with their own national law and other European legal texts. This Commentary offers a serious comparative study of the CESL alongside other instruments, such as the CISG, and also pre-existing instruments including the Draft Common Frame of Reference (DCFR) and the Principles of European Contract Law (PECL). In the future application of the CESL it is anticipated that problems will arise in relation to the uniformity that is intended by such a European legal text requiring homogeneous application by the different national courts. The drafters of the CESL have sought uniformity in order to avoid the complexity of a European sales law resulting from the application of the different sales laws of each Member State. This Commentary, coordinated by legal scholars, whom of which are members of the Valencian Study Group for the Study of European Private Law (GEVDPE)1, will contribute towards the achievement of this desired uniformity. Firstly, the process of the enactment of the CESL will be analysed, in conjunction with its scope of application, covering areas such as sale of goods, supplying (licensing) of digital content, supply of trade-related services, and consumer protection. International aspects concerned with the application of the CESL will also be analysed in this Commentary, particularly as one of the main features of the CESL—unlike other international instruments—is its optional nature, i.e. the parties must agree upon its application in order for this instrument to govern the particular contract.