McCarthy, K. S., Watanabe, M., Dai, J., & McNamara, D. S. (2020). Personalized learning in iSTART: Past modifications and future design. Journal of Research on Technology in Education, 52(3), 301–321

Report on iSTART-3, which introduces adaptive text selection. This seems to produce improvement gains for less skilled readers; skilled readers see little benefit, unlike in McNamara, D. S., O’Reilly, T. P., Best, R. M., & Ozuru, Y. (2006). Improving Adolescent Students’ Reading Comprehension with iSTART. Journal of Educational Computing Research, 34(2), 147–171.