||The current methods of ordering, delivering and invoicing of products in the construction industry is enormously inefficient, with vast quantities of paperwork, duplication of effort, scanning, re-keying and resolving mis-matches between invoices, delivery dockets and purchase orders. The purpose of this paper is to introduce the Con-struction IT Alliance eXchange (CITAX) project and, in particular, to outline the work carried out-to-date by a special interest group within the project. They are seeking to define a universal set of eXtensible Mark-Up Language (XML) message standards that will allow suppliers and contractors to exchange information with each other in supply chain activity. While the group cannot ensure that suppliers and contractors use the standard, the ultimate goal of the project is not only to have the standard in place, but also to provide the impetus to ensure that as many stakeholders as possi-ble use them. How this might be achieved is also part of the project and its success will be judged by the extent of the adoption of the standard by the industry.