Research studies on the effects of Investigations in Number, Data, and Space indicate that:
- Investigations students do as well or better than students using other curricula in straight calculation problems involving basic facts and whole number operations.
- Investigations students have a better understanding of number and number relationships than students working with more traditional programs.
- Investigations works equally well with students at different achievement levels in mathematics.
- Students who use Investigations achieve greater accuracy on word problems and on more complex calculations than students in comparison classrooms.
- Students in schools fully implementing Investigations outperform students in schools not using Investigations (or other NSF-funded elementary math curricula) on a high stakes standardized test administered in Massachusetts.