When Prisa News presented Hiberus with the Buzzfeed CMS replace- ment project to install Xalok instead, four simultaneous challenges were put on the table, which the project had to face: “How do we guarantee that HuffPost’s audience will not drop after the CMS change?” 1. The design challenge: The modification of the CMS should be transparent for end users. The website’s current design had to re- main unchanged, as it had to remain true to the spirit and character of the HuffPost brand around the world. 2. The technical challenge: Prisa’s team needed to have greater tech- nical control over the site. 3. The challenge of traffic: The change should not imply a decrease in website traffic. 4. The challenge of writing: The editorial staff found in Xalok the oppor- tunity to promote improvements and proposals, which now had a better fit of the proximity and easy communication between the teams. Key decisions: the technical-functional document The technical-functional document of the project was produced in re- cord time thanks to the collaboration of representatives of Editorial, www.hiberus.com/en 92 FEATURED ARTICLES