This study assessed the (i) ways in which, and extent to which, several aspects of nature of science (NOS) are represented in high school biology and physics textbooks in the United States (U.S.); (ii) extent to which these representations have changed over the course of several decades; and (iii) relative impact of discipline, and textbook publishers versus authors on the observed patterns. NOS aspects included the empirical, tentative, inferential, creative, theory‐laden, and social NOS; myth of “The Scientific Method”; nature of theories and laws; and social and cultural embeddedness of science. The sample included 34 (16 biology and 18 physics) textbooks, which commanded significant shares of the U.S. science textbook market. Textbooks were selected from seven “connected series” (three in biology and four in physics), which spanned 1–5 decades, with five series spanning, at least, 3 decades. Textbooks were scored for the accuracy and manner in which, as well as the extent (in textbook pages) to which, the target NOS aspects were represented. Analyses indicated that, on average, only less than 2.5% of the analyzed textbook pages were dedicated to addressing NOS constructs. Overall, representations of NOS in the textbooks did not differ by content area, were discernibly less than favorable, and did not improve substantially over the past several decades. These trends are incommensurate with the emphasis placed in U.S. reform efforts on helping precollege students develop informed NOS conceptions. Finally, the data strongly suggested that textbook authors have a relatively greater impact on the observed patterns when compared to textbook publishers. © 2016 Wiley Periodicals, Inc. J Res Sci Teach 54: 82–120, 2017

The aim of the present study is to enable future studies into students’ attitudes toward science, and related constructs, by developing and validating an instrument suitable for cross‐sectional designs. Following a thorough review of the literature it was determined that many extant instruments included design aspects that appeared to be limited in some way. The BRAINS (Behaviors, Related Attitudes, and Intentions toward Science) Survey was designed to address core criticisms that have been leveled against many existing instruments. BRAINS was rooted in a theoretical framework drawn from the theories of reasoned action and planned behavior (TRAPB). Initial development involved review by an expert panel, adaptation for online delivery and a pilot on this platform. To establish the psychometric validity of the 59‐item instrument it was administered to a representative, random sample of 1,291 Illinois students in grades 5 through 10. Confirmatory factor analysis and subsequent refinement yielded a 30‐item instrument with five factors and a good statistical fit including a RMSEA of 0.04 and a CFI of 0.95. The five factors, or constructs, of the final instrument model reflect the underlying TRAPB framework: attitudes toward science, behavioral beliefs about science, intentions to engage in science, normative beliefs, and control beliefs. © 2017 Wiley Periodicals, Inc. J Res Sci Teach 55: 172–205, 2018

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Surveying is a common methodology in science education research, including cross-national and cross-cultural comparisons. The literature surrounding students' attitudes toward science, in particular, illustrates the prevalence of efforts to translate instruments with the eventual goal of comparing groups. This paper utilizes survey data from a nationally representative crosssectional study of Qatari students in grades 3 through 12 to frame a discussion around the adequacy and extent to which common adaptations allow comparisons to be made among linguistically or culturally different respondents. The analytic sample contained 2,615 students who responded to a previously validated 32-item instrument, 1,704 of whom completed the survey in Modern Standard Arabic and 911 in English. The purpose of using these data is to scrutinize variation in the performance of the instrument between groups of respondents as determined by language of survey completion and cultural heritage. Multi-group confirmatory factor analysis was employed to investigate issues of validity associated with the performance of the survey with each group, and to evaluate the appropriateness of using this instrument to make simultaneous comparisons across the distinct groups. Findings underscore the limitations of group comparability that may persist even when issues of translation and adaptation were heavily attended to during instrument development.