This paper introduces a “design mixer” approach to usercentred interactive software design. This method overcomes the limits of a design process that favours the handling/management of a task over the understanding of the users objectives. In the following, a design case for a navigation software is outlined. The limits of the classical UCD approach are then analysed. Finally, the “design mixer” method is proposed as an improved designing tool. CATEGORIES AND SUBJECT DESCRIPTORS: H5.2. Information Interfaces and Presentation : User Interfaces - User-centered Design ; D2.2. Software Engineering : Design Tools and Techniques - User Interfaces GENERAL TERMS: Design, Human factors.