Computer keystroke logging (KSL) software is tailored to study a writer's route from their first keystroke to their final written product. Today, this software is widely available for both PC and Mac computers. Since 1998, when Sullivan et al. first suggested that Trace-it, an early Mac-based piece of KSL software, could be used in the second language (L2) writing classroom, computers have become common in schools, and mobile literacies have become ubiquitous. However, KSL's move into the second language composition classroom has generally not followed these developments. This chapter presents a vision of how KSL can be used in the L2 writing classroom to support a meta-cognitive understanding of each student's writing. In this way, the learning of L2 writing can be individualized.