The design and development of the dragoon intelligent tutoring system for model construction: lessons learned. - Jon Wetzel; Kurt VanLehn; Dillan Butler; Pradeep Chaudhari; Avaneesh Desai; Jingxian Feng; Sachin Grover; Reid Joiner; Mackenzie Kong-Sivert; Vallabh Patade; Ritesh Samala; Megha Tiwari; et al. (Interact. Learn. Environ., 2017)