This research is part of a study on scaling-up middle school science curriculum units in a large, diverse public school system. Chemistry That Applies (CTA), a guided inquiry unit based on conceptual change theory and highly rated according to the Project 2061 Curriculum Analysis, was implemented in five middle schools matched demographically with five comparison schools (N = 2,282 students). Eighth grade CTA students outscored their peers overall and when data were disaggregated, with small to medium effect sizes. Of particular interest are students with disabilities in general education science classrooms (n = 202 students with complete assessment records). Those who used CTA significantly outscored their comparison peers on the posttest, with a small to medium effect size.

Background: While recent research indicates that using human examples can be an engaging way to teach core evolutionary concepts such as natural selection and phylogenetic thinking, teachers still face potential conflicts and challenges that arise from cultural barriers to teaching and learning about evolution. The "Teaching Evolution through Human Examples" (TEtHE) project developed (1) a set of four curriculum mini-units for advanced placement (A.P.) biology that use human examples to teach evolutionary principles (Adaptation to Altitude, Evolution of Human Skin Color, Malaria, and What Does It Mean To Be Human?), and (2) a cultural and religious sensitivity (CRS) teaching strategies resource that includes background materials and two in-class activities to help teachers create a classroom environment to increase student willingness to engage the topic. Methods: This paper reports on the development and field test of the TEtHE materials in A.P. biology classes in 10 schools in 8 states during the 2012-2013 school year using a design-based research framework (cf. Anderson and Shattuck in Educ Res 41:16-25, 2012). We chose A.P. classrooms to study the potential impacts of the materials in a "best case scenario" and analyzed data about understanding and acceptance of evolution from pre-post assessments in the 10 classrooms separately to mitigate potential validity concerns arising from the design (Anderson and Shattuck in Educ Res 41:16-25, 2012; Shadish et al. in Experimental and quasi-experimental designs for generalized causal inference. Houghton Mifflin, Boston, 2002). These data were treated as a secondary source of formative data to add additional perspective to teacher self-reports, observations, student and teacher questionnaires, teacher interviews, and student focus groups. Results: Results indicate that the use of the three curriculum mini-units which focus on natural selection and the CRS classroom activities generally increased A.P. biology students' understanding and acceptance of evolution. Students whose teachers used one of the CRS activities showed generally larger increases in understanding of evolution than those whose teachers did not use one of the CRS activities. Conclusions: Although the utility of using human examples to teach evolution in college-level classes has been demonstrated in a few previous studies, this is the first national project of which we are aware to systematically explore the effect of a similar approach in high school biology classes. While we recognize that the results may be mitigated by the limitations of design-based research, particularly the absence of a comparison or control group, the general effectiveness of this approach suggested by qualitative and quantitative data in increasing student understanding and acceptance of evolution suggests that using human examples and explicitly creating a classroom environment to help students engage the topic of evolution are worth considering for further development and more robust testing.

Background: The religious or cultural objections by many people to the teaching of evolution in high school biology classrooms can impact both students' willingness to explore a scientific understanding of evolutionary theory and teachers' willingness to provide sound instruction on the topic. Pedagogical approaches designed to address this tension in the public or private US high school classroom during regular biology classroom instruction on evolution are needed. We developed a Cultural and Religious Sensitivity (CRS) Teaching Strategies Resource to aid teachers in acknowledging students' religious and cultural concerns about evolution, introducing the variety of possible relationships between science and religion, and focusing on the nature of science. The resource provides both background information for the teacher and activities to engage students in two 50-75 min directed classroom discussions. The CRS resource is part of a designed-based study, the Teaching Evolution through Human Examples (TEtHE) project that created and field tested four curriculum units for advanced placement high school biology classes that use human examples to teach evolution (Pobiner et al. Evol Educ Outreach. 2018;11:3 2018). Here we describe the design of the CRS resource and qualitative results of student focus groups that explore the extent to which the CRS resource activities helped to create a supportive classroom environment as well as more generally what benefits, if any, students derived from participating in these activities. Results: Focus groups were conducted with students from five classes of four different teachers in both public and private US high schools. Focus group transcripts were analyzed to identify common themes expressed in relation to the students' experience of one of the two CRS activities. Benefits of participating in these activities noted by students included reduced tension around the topic of evolution, a recognition that evolution is not necessarily in conflict with religious belief, and an increased understanding of the cultural context of modern and historical views about evolution. Conclusions: The themes identified through qualitative analyses of focus group transcripts support the conclusion that acknowledging students' concerns about evolution is a promising pedagogical approach to teaching evolution in conjunction with lessons designed to teach the content of evolutionary theory. The approach merits further research with general introductory high school biology classes.

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