Background: Efficacy trials in education often possess a motivating theory of change: how and why should the desired improvement in outcomes occur as a consequence of the intervention? In scenarios with repeated measurements, certain subgroups may be more or less likely to manifest a treatment effect; the theory of change (TOC) provides guidance…

A significant body of research exists on the development of early literacy skills and their relationship to the development of literacy as a whole. Phonological awareness, orthographic processing, rapid automatized naming, phonological memory, and receptive vocabulary have all been shown to be predictive of early reading outcome measures. What is…