In this paper we present an incremental and user-centered process to create suitable and usable user interfaces. Validation is done throughout the process by prototyping, the prototypes evolve from low-fidelity to the final user interface. Applications developed with this process are more likely to correspond to users' expectations. Furthermore, the process takes into account the need for sustainable evolution often required by modern soft- ware configurations, by combining traditional software engineering with a user-centered approach. We think our approach is beneficial in its scope, since it considers evolving software beyond the deployment stage and supports a multi-disciplinary team.

Designers still often create a specific user interface for every target platform they wish to support, which is time-consuming and error-prone. The need for a multi-platform user interface design approach that designers feel comfortable with increases as people expect their applications and data to go where they go. We present Gummy, a multi-platform graphical user interface builder that can generate an initial design for a new platform by adapting and combining features of existing user interfaces created for the same application. Our approach makes it easy to target new plat- forms and keep all user interfaces consistent without requiring designers to considerably change their work practice.