This study aims to investigate the effects of a literacy program. Focus lies on studying factors affecting school participation, examine whether participating schools have different results and explore the expe-riences of literacy developers regarding changes in teaching, teacher competence and student achievement. The survey is based on two groups: eight schools that participated and eight schools that did not. Data come from the National Agency databases and from a questionnaire addressed to the school literacy developers. An educational interaction model provides the theoretical framework. The study shows that participating schools have more students, are multilingual environments and recruit students whose parents have shorter education than non-participating schools. Results for grades in Swedish in grade 9 fluctuate and are difficult to interpret. The schools that participated have an increase in average merit rating and the proportion eligi-ble for upper secondary schools national programs.