Proceedings of the International Workshop – “The goal of this workshop is to bring together researchers and practitioners from the Human Computer Interaction and Software Engineering fields to determine the state-of-the-art in the interplay between usability evaluation and software development and to generate ideas for new and improved relations between these activities. The aim is to base the determination of the current state on empirical studies. Presentations of new ideas on how to improve the interplay between HCI & SE to the design of usable software systems should also be based on empirical studies.” (MAUSE COST Action 294)