Developing a mobile Web site represents an opportunity to reach a large part of the Web audience for an organization. It is also a challenge as Web engineers have to follow specific guidelines to make the mobile Web site usable. Nowadays, most mobile Web sites are not usable to varying degrees. Supporting Web engineers in their quest for mobile Web usability requires a Mobile Web Usability Standards Compliance Service (MWUCS), which incorporates the mobile Web usability standards into the mobile Web site development lifecycle. Our research aims at developing a MWUCS and a tool to put it into practice.