Same program. One study: NULL effect on student reading. Another study: significant positive effects. What changed? Not the curriculum. The implementation. The EBLI (Evidence-Based Literacy Instruction) case is the clearest illustration of a pattern that runs through the entire dyslexia intervention literature: the what of a program matters less than the how of its delivery. Practitioner training intensity. Supervisory infrastructure. Dose. Learner-program match. Fidelity mon