The second edition of Investigations in Number, Data and Space became available for full-year implementation during the 2007-2008 school year.
What do we know about the impact of the 2nd edition on student achievement?
- In an efficacy study conducted by Gatti Evaluation Inc., students randomly assigned to teachers implementing Investigations for the first time performed as well or better on the GMADE than their peers, who were randomly assigned to teachers using well-established curricular materials that they were more familiar with. Analyses of sub-test scores show a pattern of results that are especially compelling in the older (4th to 5th grade) cohort. Strong results for the older cohort were also found on a researcher-created performance measure designed to reflect NCTM's Focal Points and assess more complex multi-step problem solving. Analyses of students’ self-reported attitudes towards mathematics and mathematics instruction also showed more positive results for the students assigned to Investigations classrooms than those in the comparison classrooms. Learn more about the details of this study.
- During the field-testing of the 2nd edition, an evaluation study was conducted by Kehle and colleages at Indiana University. In a carefully matched comparison study, within two geographically distinct sites, students in classrooms using the pre-publication versions of the Investigations materials performed as well as or better on both standardized tests and researcher-created tests of student achievement. One site showed strong effects in favor of the Investigations classrooms while the other site showed no difference between groups. Learn more about the details of this study.