We design a machine which adapts to the user considering personal differences. This paper deals with the interactive relationship in which both the user and the machine try to adapt to each other. We call this relationship interactive adaptation. The interactive adaptive interface (IAI/F) is an intelligent interface which is designed in consideration of interactive adaptation. This interface changes the characteristics of the system according to the given task, taking into consideration the state of the user, such as skill level, technique, characteristics, physical conditions. We propose a design and realization method for the IAI/F, based on recursive fuzzy reasoning. As an application example, we present a virtural-reality simulation game and apply the proposed IAI/F based on the user's performance and the skin potential reflex (G.S.R.). We present the system considering interactive adaptation, and show some experimental results and statistical evaluation results to discuss its effectiveness.
