When Zhao Zichun, founder and CEO of Koala Reading, was studying at Columbia University in 2014, he had his first encounter with Lexile, a system used in the US to measure the reading level of about half of all students in third through 12th grade.
Zhao was given the chance to sit in on an English class at an American elementary school that adopted Lexile measures. The teacher asked students to read the same article in multiple versions that differed in level of difficulty. Students with weaker reading comprehension skills could consequently understand the text as well as their more literate p...
