This article describes the findings of a review of existing K-8 scienc
e curriculum materials that was carried out under the National Science
Curriculum Project for High-Ability Learners. Twenty-seven sets of ma
terials were reviewed using criteria developed and refined by project
staff. The purpose of the review was to ascertain whether currently av
ailable materials met the new standards in the teaching of science and
the needs of gifted learners. The review findings suggest that existi
ng basal textbooks fail to meet new science curriculum standards for a
ll students, but particularly for high-ability learners. Modular progr
ams and supplementary materials were found to be superior to basal tex
tbooks on most dimensions.