The GAMA-X system is a semi-automatic generator of assisted interfaces. It aims at being an UIMS (User Interface Management System) for the Camila system capable of providing an user interface that can be used at all levels of the application development cycle from the prototype to the nal implementation. The GAMA-X system is divided into two main modules the MGI (Interface Generation Module) and the MIU (User Interaction Module). The MGI generates an user interface specication or MIU specication from the computational layer specication The MIU creates an user interface based on the specication generated by the MGI. The MIU specications can be generated by the MGI or hand written from scratch In this manual we show with an example how to write the MIU specication.