The easy participation of end users within an agent system was one of the goals in the Itchy Feet project. Considerable effort has therefore been put in the development of clear and concise user interfaces that are accessible to different types of user groups. For the development of the user interfaces we employed several well known usability heuristics, guidelines and best practices. These included the 10 usability heuristics of Nielsen [19] and the recommendations of the ISO 9241 standard part 110 on dialog practices [14]. The design and development of the 3D Virtual World and 3D interaction features was based on guidelines and methodologies that have been established in the Virtual Reality domain. The development and evaluation followed an iterative approach that had been proposed by Gabbard et al. [12]. Furthermore, we employed additional guidelines for the design and evaluation [16] and [28].