1. Department of Educational Technology, Research, and Assessment, Northern Illinois University, DeKalb, IL, USA
2. Department of Industrial and Systems Engineering, Northern Illinois University, DeKalb, IL, USA
3. Department of Early Childhood, Youth, and Family Studies, Ball State University, Muncie, IN, USA
4. Department of Instructional Design, Development and Evaluation, Syracuse University, Syracuse, NY, USA
5. Division of Computer Science & Engineering, Sunmoon University, Chungnam Asan-si, South Korea