In major infrastructure projects, several systems need to work together to achieve a common goal. Getting these systems to work together is no easy feat. Each point where a system is to make contact with another system is an interface. The complexity of such mega projects makes it very important to employ suitable interface management processes right from the beginning of the project. Errors, insufficient planning or overlooked details can result in extensive delays and additional costs. In this study, the interface management process, being employed for the first time in Egyptian infrastructure projects, is introduced. First, the different types of interfaces are identified. Interface documentation including the interface management plan, interface matrix, interface register, interface control form and the interface agreement are explored. Next, the interface process is studied through the three stages of a project lifecycle. And finally, the key steps are developed by integrating the required input and documentation during the interface lifecycle and work stages in a schematic diagram.