5. Results The impact of curriculum adjustments according to the DI approach on child- ren's achievement were investigated through the Mann-Whitney U and Wil- coxon statistical tests, since the data did not satisfy the regularity condition. 5.1. Differences between and Inside the Groups Firstly, to study the differences between the two groups of children, Mann- Whitney U test for independent groups was employed for each intervention. Spe- cifically, at the 1* intervention "Protection of the wild animals", the experimental