This paper refers to the dynamic approach to school improvement (DASI) which attempts to contribute to the merging of educational effectiveness research and school improvement. The main underlying assumptions and the implementation phases of DASI are discussed. Moreover, a study aiming to compare the impact of DASI in helping schools to reduce bullying is presented. The results reveal that DASI has a stronger impact on improving school factors and reducing bullying than other approaches to school improvement. Suggestions for further research investigating the sustainability of DASI on school effectiveness are provided and policy implications are drawn.