My research is on the design and evaluation of technologies for children that go beyond the desktop computer and which increasingly merge the physical and digital worlds, especially Tangible Technologies. The work involves methodology research on evaluation methods for children's interactive products: by looking at the traditional evaluation methods and in search for the methods for children's Tangible Technology. The research will contribute to paradigms such as the design and evaluation of 'disappearing computer' and 'tangible computing'. The research involves empirical evaluation studies and the design of prototype systems.