The importance of comprehensive reform-oriented curricula fbr the wide
-scale improvement of elementary school mathematics has long been reco
gnized. This article is a case study of one such curriculum, Math Trai
lblazers, from the Teaching Integrated Mathematics and Science (TIMS)
Project at the University of Illinois at Chicago. Math Trailblazars an
d other TIMS materials attempt to integrate mathematics and science by
emphasizing science as method and by focusing on a small set of varia
bles that are thought to be fundamental. The TIMS materials are examin
ed in a framework that considers the meaning of math and science integ
ration and its possible advantages and disadvantages, and the difficul
ties in writing and implementing integrated materials.