Nowadays, with the growing popularity of the Internet and mobile devices, interactive systems have increasingly gained ground among different people, with different cultural backgrounds. However, the design of the interaction that takes place between the users and those systems is not properly supported by tools nor notations, turning the interactive experience into a mere consequence of the internal functions of the systems – in which errors are treated as exceptions and must therefore be avoided, instead of properly supported. This work presents a study on how systems design might be supported by a model that combines interaction and interface design, and a tool to support this modeling and to generate prototypes, supporting the designer’s reflection about the interactive solution being created. The MoLIC language is used to represent the systems behaviour and sketches are used to represent the interface in a combined model. The prototypes are generated from a sequence of sketches, guided by the interaction model. An exploratory study was conducted in order to gather feedback about the proposed approach and to investigate the feasibility of the integrated project of interaction and interface.