Before revision:  We examined the operators' gazeand head movements, and hand interactions to essential regions (hotspotson machine surface) to determine behavioral differences among continuous skill improving experiences. We modeled the variety of user behaviors to an extensive task model with a two-step automatic approach, baseline model selection and experience integration.
After revision:  We examined the operators' gazeand head movements, and hand interactions with hotspots, and observed significant behavioral changes as a result of continuous skill improvement. We automatically modeled the variety of user behaviors to an extensive task model with a two-step automatic approach, baseline model selection and experience integration.