We present the interaction design and the component architecture of an adaptive \ authoring system based on a consumer-range 3D input device. We claim that this \ system can help both novice and experienced users performing authoring tasks in \ a 3D authoring environment. The system uses a keyboardless \ self-adaptive interaction controller built upon a rule-based system that learns \ and infers the user's behavior/condition on the fly according to her actions; \ rearranging rules when necessary and suggesting breaks to avoid performance \ drops caused by fatigue or the so-called gorilla-arm effect. \