Presenting course materials in a way to demonstrate the lesson (and to consider attention span) is critical. Studies show the importance of considering the attention span factor (Mizuno et al., 2011). Reference Kei Mizuno, Masaaki Tanaka, Sanae Fukuda, Emi Yamano, Yoshihito Shigihara, Kyoko Imai-Matsumura, Yasuyoshi WatanabeLow (2011). visual information-processing speed and attention are predictors of fatigue in elementary and junior high school students. Behav Brain Funct. 7: 20. Published online 2011 June 14. doi: 10.1186/1744-9081-7-20 PMCID: PMC3126715