“…The three identified factors related to 1) evaluations of the program or content matter (eight items, such as "I would recommend this program to other students" and "I would like to learn more about electrical circuits", with factor loadings ranging from .47 to .77), 2) evaluations of the graphics used in the program (four items, such as "The graphics made the lesson easier to understand" and "The graphics in the program helped me to learn", with factor loadings ranging from .55 to .75), and 3) difficulty ratings (six items, such as "The lesson was difficult" and "The topics that were covered in the lesson were difficult", with factor loadings ranging from .41 to .90). As measured by Cronbach's alpha (Allen, Reed-Rhoads, Terry, Murphy, & Stone, 2008), the internal reliability of the program rating scale was .91, internal reliability of the graphics rating scale was .86, and internal reliability of the difficulty ratings was .89. A program ratings score, a graphics ratings score, and a perceived difficulty score were computed by averaging the ratings from the respective questions which loaded on these factors.…”