An adaptive guidance system that supports equipment operators requires a comprehensive model of task and user behavior that considers different skill and knowledge levels  as well as diverse situations.
<clarity> An adaptive guidance system that supports equipment operators requires a comprehensive model of task and user behavior that considers different skill and knowledge levels  as well as diverse situations.
An adaptive guidance system that supports equipment operators requires a comprehensive model , which involves a variety of user behaviors that considers different skill and knowledge levels as well as diverse situations.