Effects of the Enactive, Iconic, Symbolic (EIS) Intervention on Student Math Skills in Primary School

«Enactive, Iconic, Symbolic» (EIS) is a recently developed program modeled after instructional methodologies used in the Singapore math approach. The intervention emphasizes sequential mastery of math concepts, problem solving, and the use of the Con- crete to Pictorial to Abstract approach (CPA). This quasi-experimental study evaluates the impact of EIS program on student math performance to explore the applicability of the Singapore approach in the Italian context and define the most appropriate methods for future large-scale evaluations. Eleven third- through fifth-grade treatment classes were matched comparison classes using propensity score matching, with mathematics performance measured before and after the intervention. A two-level random intercept hierarchical linear model was used to estimate treatment impact. We found no statistical significance effects of EIS after 16-20 weeks, ranging between 0.12 to 0.35 standard deviation units. The findings suggest the need for further investigations through large- scale evaluations.