This study evaluates the efficacy of the Lexia Reading (LR) programme with a cohort of 37 students in a Decile 1 primary school. The students were randomly assigned to experimental (who used LR) and control groups (who did not use LR). The WIAT-II was used to provide pre and post measures of literacy skills. Results indicated that students who used LR did not outperform students in the control group and no statistical significance was found between the two groups at post-test. The study discusses the evidence base that Lexia presents in support of LR and raises questions in relation to LR efficacy. The study concludes that the LR computer programme's evidence base and efficacy is equivocal. (Contains 3 tables.)