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The Teachers Integrating Engineering into Science (TIES)Program is a collaborative project among faculty from the College of Education and the College of Engineering at the University of Nevada, Reno. The TIES project paired university faculty with middle school science teachers to create three units that included engineering design using a variety of interactive learning activities in order to engage a wide range of students. The units included a Web-based simulation activity, lesson plans, a design project, and three types of assessments that were standardized across schools. Results of assessments were disaggregated by gender, ethnicity, special education, and socio-economic level. Mean scores for these student population groups were compared to mean scores for the same groups on the 2004 Nevada eighth grade science criterion referenced test. These results indicate that engaging students in engineering curriculum activities may diminish achievement gaps in science for some student populations.

The difference in gain scores produced by traditional pretests and those produced by retrospective pretests when compared to posttest scores on the Science Teaching Efficacy Belief Instrument for preservice teachers was investigated in this study. Results indicated that gain scores using the traditional pretest produced significant improvement in one factor, but not in the other, which is congruent with most other results for this instrument found in the literature. However, gain scores produced by using retrospective pretests produced a greater magnitude of significance for the first factor, and also produced significant gains for the second factor. Follow‐up interviews with participants provided evidence for greater internal validity for the retrospective pretest. Findings support the notion that retrospective pretests may produce gain scores with greater validity and greater statistical power.

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