The 2nd edition of Investigations in Number, Data, and Space is the result of more than 20 years of development. In 1986, the National Science Foundation (NSF) funded TERC to develop Used Numbers—units that focus on data analysis in grades K-6. Later, funding from the California Department of Education supported the development of a replacement unit called Seeing Fractions. Then, in 1990, NSF funded TERC to develop a coherent K-5 mathematics curriculum: the first edition of Investigations in Number, Data, and Space.
The 2nd edition of Investigations—developed by TERC, in collaboration with over 50 classroom teachers, over the course of 5 years—is based on:
- what was learned over the course of more than 10 years of implementation of the 1st edition
- the publication of NCTM's Principles and Standards for School Mathematics in 2000
- continued research in the field of math education
- two full years of field testing in a variety of classroom settings
The 2nd edition of Investigations was funded by TERC, the National Science Foundation*, and Pearson Scott Foresman.
*Investigations was developed with support from the National Science Foundation under Grant No. ESI-0095450. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
