applied in the world. Such knowledge is inherently multimodal because it requires the co-ordination of the various senses. Two key characteristics of enactive knowledge are that it is experential it relates to doing and depends on the user's experience, and it is cultural: the way of doing is itself dependent upon social aspects, attitudes, values, practices, and legacy. Enactive interfaces are related to a fundamental interaction concept that often is not exploited by existing human-computer interface technologies. As stated by cognitive psychologist Jerome Bruner, the traditional interaction with the information mediated by a computer is mostly based on symbolic or iconic knowledge, and not on enactive knowledge. While in the symbolic way of learning knowledge is stored as words, mathematical symbols or other symbol systems, in the iconic stage knowledge is stored in the form of visual images, such as diagrams and illustrations that can accompany verbal information. On the other hand, enactive knowledge is a form of knowledge based on active participation, knowing by doing, by living rather than thinking. "Any domain of knowledge (or any problem within that domain of knowledge) can be represented in three ways: by a set of actions appropriate for achieving a certain result (enactive representation); by a set of summary images or graphics that stand for a concept without defining it fully (iconic representation); and by a set of symbolic or logical propositions drawn from a symbolic system that is governed by rules or laws for forming and transforming propositions (symbolic representation)" A particular form of knowledge is a skill, juggling being a simple example, and the acquisition of a skill is one area where enactive knowledge is evident. The sensorimotor and cognitive activities involved in acquiring skills are tabulated by the SKILLS FP6 European skills project. Multimodal interfaces Multimodal interfaces are a good candidate for the creation of Enactive interfaces because of their coordinated use of haptic, sound and vision. Such research is the main objective of the ENACTIVE Network of Excellence, a European consortium of more than 20 research laboratories that are joining their research effort for the definition, development and exploitation of enactive interfaces. ENACTIVE Network of Excellence The research on enactive knowledge and enactive interfaces is the objective of the ENACTIVE Network of Excellence. A Network of Excellence is a European Community research instrument that provides fundings for the integration of the research activities of different research laboratories and