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This exploratory study aimed to assess the strength of primary school students' (aged 11–12 years old) Science Self-Efficacy (SSE) beliefs, identify emanating sources, and investigate any gender-related differences. School SSE is defined here as perceived capacity to complete learning outcomes from the upper Irish primary science curriculum. The strengths and sources of participants' school SSE beliefs were assessed quantitatively (N = 260) using the Irish Science Self-Efficacy Children's Questionnaire (IS-SEC-Q). Twenty-five students were interviewed to further explore the origins of their SSE, and their perception of science in the classroom. Results indicated that students' self-efficacy to perform scientific skills was lower than their self-efficacy to answer questions. Mastery experience was found to be the strongest predictor of self-efficacy in science skills, corroborating findings from other educational contexts. However, students report that they seldom engage in hands-on science during school, suggesting that Irish classrooms still lack student-led investigations. Gender-related results are also highlighted. This work serves as the first report of students' school SSE beliefs in Ireland, expands upon existing literature surrounding the SSE beliefs of pre-adolescent students, and discusses implications for classroom practice. [ABSTRACT FROM AUTHOR]

In response to growing concerns about adolescents' low expectations for science-related careers, this study explores the mechanisms of the ternary associations among science learning experiences, science-related attitudes and beliefs, and science-related career expectations, involving a sample of 9841 15-year-old students from four Chinese provinces (Beijing, Shanghai, Jiangsu, and Guangdong) who took part in the sixth cycle of the Programme for International Student Assessment (PISA). The results of the path analysis reveal that (i) both formal and informal learning experiences had positive relationships with science-related attitudes and beliefs; (ii) enjoyment of science, science self-efficacy, science outcome expectations, and epistemological beliefs about science had positive effects on career expectations; (iii) inquiry-based learning experiences were negatively associated with career expectations, although the direct association was suppressed by enjoyment of science, science self-efficacy, and science outcome expectations; (iv) teacher-directed science learning experiences had a positive impact on career expectations, fully mediated by enjoyment of science, epistemological beliefs about science, and science outcome expectations; and (v) all four science-related attitudes and beliefs played full mediating roles in the relationship between informal science learning experiences and career expectations. [ABSTRACT FROM AUTHOR]

The purpose of this study is to investigate howHarmony Public Schools' (HPS) ' Class of 2024 high school students' current selves (high school experience, math and science efficacy, parent, and teacher expectations) affect to possible future selves (i.e. choosing a science, technology, engineering, and mathematics [STEM]-major in college). 1464 tenth grade students participated in the study. We utilised logistic regressions for the study. It was found that males are 1.9 times more likely to consider STEM majors in college. African American students are least likely to choose STEM majors compared to all other ethnicities. Students who had STEM professional relatives are more likely to choose a STEM major in college. Students with higher self and parent encouragements are 1.2 and 1.3 times more likely to select a STEM major after graduation, respectively. Students with more STEM club participation, more STEM competitions (e.g. science fairs, mathematics Olympiads etc.), and higher GPA scores are more likely to plan majoring in STEM areas in college compared to less of each. Finally, students with higher math self-efficacy and science self-efficacy scores are 1.3 and 1.5 times more likely to choose a STEM-related area in college compared to students with lower math and science self-efficacy scores. [ABSTRACT FROM AUTHOR]

While the United States (U.S.) and Canada share features in their secondary education systems (e.g. proportion of immigrants), these nations have differences (e.g. linguistic). Given the primacy of Canada over the U.S. vis-à-vis science literacy [as measured by the Programme International for Student Assessment (PISA)], underlying differences in science dispositions and school climate variables could exist. The PISA 2015 science-focused dataset, including 5712 students in 172 schools in the U.S. and 20,058 students in 645 schools in Canada, was modelled via multilevel methods to assess associations among science dispositions (epistemology, enjoyment, interest, instrumental, self-efficacy activities) and science literacy. Associations of school climate variables of instructional leadership, disciplinary climate and teaching support (the latter two in the context of science classes) with the above measures were evaluated. Disciplinary climate was more often associated with science dispositions (as outcome measures) in the U.S., while teaching support was most often associated with these measures for Canada. Disciplinary climate was associated with science literacy (as an outcome measure) in the U.S.; in contrast, no school climate measures were associated with science literacy in Canada. These results support an emphasis on disciplinary climate in U.S. science classrooms, but an emphasis on teaching support in Canadian science classrooms. [ABSTRACT FROM AUTHOR]

A growing body of literature shows that Primary Scientific Literature (PSL) is a valuable and useful tool for STEM. Current assessments measuring the success of PSL-based interventions focus mainly on specific scientific content and/or the specific scientific skills students learn. We believe that the underlying motivation students consider while learning to read PSL is equally important to assess. We present 'Motivation in Reading Primary Scientific Literature,' a 19 item novel questionnaire based on student purpose for reading PSL and student efficacy for reading PSL. Exploratory and confirmatory factor analyses (EFA and CFA) were performed on data collected from students enrolled in introductory Biology courses (n = 411 for EFA and n = 325 CFA). Results confirmed 19 items that can be used to measure student motivation in reading PSL through four subscales: (1) expectancy-value, (2) self-efficacy, (3) performance/competence and (4) interest. Preliminary external validity of the Motivation in Reading PSL questionnaire verified differences (p <.05) in students' motivation between one control and two treatment groups after a one-semester PSL-based intervention. These findings suggest that our questionnaire can be used by instructors who implement PSL-based interventions and would like a more comprehensive understanding of how their students approach reading PSL. [ABSTRACT FROM AUTHOR]

The current study investigates the developmental trajectories of novice elementary teachers' self-efficacy science beliefs, their science instructional beliefs and science knowledge over the course of participants' teacher preparation and into their first two years of teaching. Study results indicate changes in teachers' self-efficacy science beliefs, in their science instructional beliefs, and changes in science knowledge. Additionally, teachers' growth in science content knowledge had an impact on teachers' self-efficacy science beliefs and on teachers' instructional science beliefs. Findings from our study can help teacher educators, researchers, and policy makers in better understanding novice elementary teachers' science developmental trajectories and the role of knowledge and beliefs in their professional growth. [ABSTRACT FROM AUTHOR]

The relationship between inquiry-based learning and science self-efficacy was analysed using data from 57 countries and economics participating in the 2015 Programme for International Student Assessment (PISA). This analysis generated a mediating–moderating model, which involved the mediating role of science interest and the moderating role of teacher support. The results indicated that (1) inquiry-based learning had a significant positive correlation with science self-efficacy; (2) science interest partially mediated the relationship between inquiry-based learning and science self-efficacy, with an indirect effect accounting for 20.1% of the total effect; and (3) teacher support moderated the direct effect positively while moderating the indirect effect negatively. These details of the link between inquiry-based learning and science self-efficacy provided theoretical guidance and practical support to improve the application of inquiry-based learning in science education. [ABSTRACT FROM AUTHOR]

Historically women have been underrepresented in the fields of science, technology, engineering and mathematics (STEM). Some scholars have suggested that science self-concept perceptions have contributed to this gender gap. We propose and empirically examine a model of the relationships between gender, sexual orientation, science self-efficacy, and science identity. Specifically, we hypothesise that a key explanation for why gender differences in science identity exist may be that science self-efficacy is intervening in the relationship between gender and science identity. Surveys were administered to 964 first-year university students in the U.S. Science self-efficacy mediated the relationship between gender and science identity for heterosexual students, but not for non-heterosexual students. Whereas external factors that may affect gender differences in science self-concept perceptions should be considered, such as boosting females' participation in science courses, the internal self-concept perceptions that individuals use to make decisions about STEM are of particular importance. Our results help to provide a better understanding of the roles that gender and sexual orientation play in science self-efficacy and science identity, and we hope that a better grasp of these relationships offers a step toward addressing the projected shortage of STEM workers. [ABSTRACT FROM AUTHOR]

The aim of this study was to develop an instrument to measure upper-level Chinese elementary students' attitudes towards science by addressing problems with existing ones, as highlighted in the literature. The theoretical framework was drawn from the ABC model, which defines attitudes towards science as consisting of affective, behavioural, and cognitive domains in the study. Instrument development was performed through expert review, small-scale pilot tests and student interviews, large-scale field tests and validation. Factor analysis and Rasch analysis provided reliability and validity evidence. According to the results of the first round of the field test, changes were made to the items and the response category in the second round of the development procedure. The final instrument demonstrated good psychometric properties and consisted of four dimensions: enjoyment of science learning, self-efficacy in science learning, value of science learning and intention to learn and do science. [ABSTRACT FROM AUTHOR]

This study aims to examine the moderating effect of teacher feedback on the associations among inquiry-based science teaching and learning practices and students' science-related attitudes and beliefs. The data set included 9, 841 15-year-old students from four Chinese provinces (Beijing, Shanghai, Jiangsu, and Guangdong) who took part in the sixth cycle of the Programme for International Student Assessment (PISA). Multiple regression analyses revealed a significant negative association between inquiry-based science practices and students' epistemological beliefs about science, but the teacher feedback could significantly and positively moderate this association. The results also showed that inquiry-based science practices had significant positive relationships with students' interest in and enjoyment of science, and science self-efficacy. Moreover, teacher feedback was significantly and positively associated with students' epistemological beliefs, interest in and enjoyment of science throughout the inquiry process. This study sheds light on the optimal implementation of inquiry-based practices, especially towards improving students' science-related attitudes and beliefs. [ABSTRACT FROM AUTHOR]

Toward the end of 6th grade, some bright and highly motivated science-oriented Israeli students and their parents are required to make a decision: whether or not to enrol in a non-mandatory advanced science programme for 7th graders (≈12 year olds) upon entering middle-school. In other words, for many students, entry into the STEM pipeline begins at an earlier age than previously reported and, to date, reasons for doing so are unknown. The aim of this study was to identify and model the factors that contributed to enrolment. Data collected from 7th graders in three Israeli middle-schools (N = 615) included self-efficacy and interest in STEM learning, perceived parental encouragement to learn STEM, perceived peer interest in STEM, recollections of STEM learning in primary schools and participation in informal STEM programmes. Path analysis showed that 'self-efficacy', 'parents', 'peers' and 'participation' directly predicted enrolment. Self-efficacy mediated the effects of environmental variables on academic choice. The significant effect of participation in informal STEM programmes points toward an even earlier entry into the STEM pipeline. Quantitative content analysis was used to categorise the reasons for enrolling in the advanced science programmes (N = 179). Unexpectedly, students overwhelmingly cited practical importance ('utility value') vis-à-vis short, medium and long-term goals. [ABSTRACT FROM AUTHOR]

Informal science learning has been proven to have effects on a variety of science learning outcomes. This study explored the direct and indirect influence of both prior and current informal science learning on science performance by using data from the Programme for International Student Assessment 2015. More than ten kinds of informal science learning activities were measured. Multi-level structural equation modelling was used to investigate the mediating role of science interest and self-efficacy in the relationship between informal science learning and science performance in the United Kingdom, Hong Kong, and South Korea. The results showed that prior informal science learning has a positive effect on current informal science learning and a direct influence on science performance. In addition, informal science learning significantly influenced science performance through science interest and self-efficacy. These results were consistent across three countries or regions with different cultures and science learning conditions even after controlling for background variables at student and school level. [ABSTRACT FROM AUTHOR]

This study aimed to explore the relationships between students' perceived learning practices and associated self-efficacies regarding mobile-assisted seamless science learning. The learning practices for mobile-assisted seamless science learning questionnaire was developed with three scales that denote learning supported by mobile technology. These scales included authentic learning, self-directed learning, and collaborative learning with information and communication technology. Associated self-efficacies promoted by mobile-assisted seamless science learning could include authentic problem-solving, creative thinking and academic self-efficacy. A sample of 312 primary school students from China responded to the mobile-assisted seamless science learning questionnaire. Confirmatory factor analyses indicated that the mobile-assisted seamless science learning questionnaire had high reliability and validity. The path analysis results analysed via a structural equation modelling technique implied that primary school students' perceived self-directed learning and authentic learning were important as positive predictors for authentic problem-solving efficacy, which may function as a partial mediation variable in the effect of students' perceptions of learning practices on the academic self-efficacy of mobile-assisted seamless science learning. The findings highlighted that learning practices (i.e. authentic learning and self-directed learning) and authentic problem-solving efficacy are both indispensable and mutually reinforcing. This can provide some insights for promoting mobile learning in science learning in the future. [ABSTRACT FROM AUTHOR]

Current studies reveal that meta-level variables are very important in learning; however, little research has been devoted to the role of metaconceptual and meta-affective variables on student achievement. With the aim of filling this gap in the literature, the present study investigated the relationship between metavariables (metaconceptual awareness, metaconceptual regulation, affective awareness, and affective regulation) and science achievement with the mediating effect of science self-efficacy through structural equation modeling. A total of 576 eighth grade students participated in the study. Results indicated that science self-efficacy partially mediated the relationship that metaconceptual regulation and affective regulation have with science achievement. In other words, students who monitor and evaluate their existing conceptions and follow, control, and adapt their emotions are likely to have high science self-efficacy and then high science achievement. In addition, metaconceptual awareness, metaconceptual regulation, and affective regulation positively predicted science self-efficacy, which was itself a positive predictor of science achievement. The findings imply that metavariables are essential components of science achievement via self-efficacy. [ABSTRACT FROM AUTHOR]

Decline in student motivation is a concern for STEM education, especially for underrepresented groups in the sciences. Using the Science Motivation Questionnaire II, 41 foundational STEM courses were surveyed at the beginning and end of each semester in an academic year at a small primarily undergraduate university. Significant pre- to post-semester declines were observed in each of five measured motivational factors (Intrinsic motivation, Career motivation, Self determination, Self-efficacy, and Grade motivation), with effect sizes ranging from 0.21 to 0.41. However, in the second semester pre-survey, four motivational factors rebounded, including three returning to initial levels, suggesting that the observed motivational decline is not long-lasting. Analysis suggests that declines are not related to survey fatigue or student demographics, but rather to grades and, in the case of one motivational factor, to academic field. These findings suggest that a refocus on grading practices across STEM fields may influence student motivation and persistence in STEM. [ABSTRACT FROM AUTHOR]

Science learning self-efficacy could be regarded as a multi-factor belief which comprises different aspects such as cognitive skills, practical work, and everyday application. However, few studies have investigated the relationships among these factors that compose science learning self-efficacy. Also, culture may play an important role in explaining the relationships among these factors. Accordingly, this study aimed to investigate cultural differences in science learning self-efficacy and examine the relationships within factors constituting science learning self-efficacy by adopting a survey instrument for administration to students in the U.S. and Taiwan. A total of 218 university students (62.40% females) were surveyed in the U.S.A, and 224 university students (49.10% females) in Taiwan were also invited to take part in the study. The results of the structural equation modelling revealed cultural differences in the relationships among the factors of science learning self-efficacy. It was found that U.S. students’ confidence in their ability to employ higher-order cognitive skills tended to promote their confidence in their ability to accomplish practical work, strengthening their academic self-efficacy. However, the aforementioned mediation was not found for the Taiwanese participants. [ABSTRACT FROM AUTHOR]

In the area of science education research, studies have attempted to investigate conceptions of learning, approaches to learning, and self-efficacy, mainly focusing on science in general or on specific subjects such as biology, physics, and chemistry. However, few empirical studies have probed students’ earth science learning. This study aimed to explore the relationships among undergraduates’ conceptions of, approaches to, and self-efficacy for learning earth science by adopting the structural equation modeling technique. A total of 268 Taiwanese undergraduates (144 females) participated in this study. Three instruments were modified to assess the students’ conceptions of, approaches to, and self-efficacy for learning earth science. The results indicated that students’ conceptions of learning made a significant contribution to their approaches to learning, which were consequently correlated with their learning self-efficacy. More specifically, students with stronger agreement that learning earth science involves applying the knowledge and skills learned to unknown problems were prone to possess higher confidence in learning earth science. Moreover, students viewing earth science learning as understanding earth science knowledge were more likely to adopt meaningful strategies to learn earth science, and hence expressed a higher sense of self-efficacy. Based on the results, practical implications and suggestions for future research are discussed. [ABSTRACT FROM PUBLISHER]

The purpose of this research was to develop and test a model of factors contributing to science, technology, engineering, and mathematics (STEM) learning and career orientation, examining the complex paths and relationships among social, motivational, and instructional factors underlying these outcomes for middle school youth. Social cognitive career theory provided the foundation for the research because of its emphasis on explaining mechanisms which influence both career orientations and academic performance. Key constructs investigated were youth STEM interest, self-efficacy, and career outcome expectancy (consequences of particular actions). The study also investigated the effects of prior knowledge, use of problem-solving learning strategies, and the support and influence of informal educators, family members, and peers. A structural equation model was developed, and structural equation modeling procedures were used to test proposed relationships between these constructs. Results showed that educators, peers, and family-influenced youth STEM interest, which in turn predicted their STEM self-efficacy and career outcome expectancy. STEM career orientation was fostered by youth-expected outcomes for such careers. Results suggest that students’ pathways to STEM careers and learning can be largely explained by these constructs, and underscore the importance of youth STEM interest. [ABSTRACT FROM PUBLISHER]

This study aims to explore Taiwanese university students’ conceptions of learning biology as memorizing or as understanding, and their self-efficacy. To this end, two questionnaires were utilized to survey 293 Taiwanese university students with biology-related majors. A questionnaire for measuring students’ conceptions of memorizing and understanding was validated through an exploratory factor analysis of participants’ responses. As for the questionnaire regarding the students’ biology learning self-efficacy (BLSE), an exploratory factor analysis revealed a total of four factors including higher-order cognitive skills (BLSE-HC), everyday application (BLSE-EA), science communication (BLSE-SC), and practical works (BLSE-PW). The results of the cluster analysis according to the participants’ conceptions of learning biology indicated that students in the two major clusters either viewed learning biology as understanding or possessed mixed-conceptions of memorizing and understanding. The students in the third cluster mainly focused on memorizing in their learning while the students in the fourth cluster showed less agreement with both conceptions of memorizing and understanding. This study further revealed that the conception of learning as understanding was positively associated with the BLSE of university students with biology-related majors. However, the conception of learning as memorizing may foster students’ BLSE only when such a notion co-exists with the conception of learning with understanding. [ABSTRACT FROM PUBLISHER]

This study uses hierarchical linear modeling to examine the influence of a range of factors on the science performances of Hong Kong students in PISA 2006. Hong Kong has been consistently ranked highly in international science assessments, such as Programme for International Student Assessment and Trends in International Mathematics and Science Study; therefore, an exploration of the factors that affect science performances of Hong Kong students can give a lens to examine how science education can be improved in Hong Kong and other countries. The analyses reveal that student backgrounds as male, at higher grade levels, and born in mainland (when in the same grade) are associated with better science performance. Among the attitudinal factors, enjoyment of science and self-efficacy in science play important roles in scientific achievements. Most of the parental factors, on the other hand, are not having significant impacts on achievement after student attitudes are taken into account, with only parents’ value of science having a small effect. School student intake is found to be a strong predictor of school average achievement, as well as a major mediator of the effects of school enrollment size and school socio-economic status. The findings differ from recently reported results, which suggested that school enrollment size was associated with achievement. This study also points out the problems of the use of science instruction time as a school-level variable to explain science achievement in Hong Kong. [ABSTRACT FROM PUBLISHER]

Inquiry-based curricula are an essential tool for reforming science education yet the role of the teacher is often overlooked in terms of the impact of the curriculum on student achievement. Our research focuses on 22 teachers’ use of a year-long high school urban ecology curriculum and how teachers’ self-efficacy, instructional practices, curricular enactments and previous experience impacted student learning. Data sources included teacher belief surveys, teacher enactment surveys, a student multiple-choice assessment focused on defining and identifying science concepts and a student open-ended assessment focused on scientific inquiry. Results from the two hierarchical linear models indicate that there was significant variation between teachers in terms of student achievement. For the multiple-choice assessment, teachers who spent a larger percentage of time on group work and a smaller percentage of time lecturing had greater student learning. For the open-ended assessment, teachers who reported a higher frequency of students engaging in argument and sharing ideas had greater student learning while teachers who adapted the curriculum more had lower student learning. These results suggest the importance of supporting the active role of students in instruction, emphasising argumentation, and considering the types of adaptations teachers make to curriculum. [ABSTRACT FROM PUBLISHER]

Due to the scarcity of cross-cultural comparative studies in exploring students' self-efficacy in science learning, this study attempted to develop a multi-dimensional science learning self-efficacy (SLSE) instrument to measure 316 Singaporean and 303 Taiwanese eighth graders' SLSE and further to examine the differences between the two student groups. Moreover, within-culture comparisons were made in terms of gender. The results showed that, first, the SLSE instrument was valid and reliable for measuring the Singaporean and Taiwanese students' SLSE. Second, through a two-way multivariate analysis of variance analysis (nationality by gender), the main result indicated that the SLSE held by the Singaporean eighth graders was significantly higher than that of their Taiwanese counterparts in all dimensions, including ‘conceptual understanding and higher-order cognitive skills’, ‘practical work (PW)’, ‘everyday application’, and ‘science communication’. In addition, the within-culture gender comparisons indicated that the male Singaporean students tended to possess higher SLSE than the female students did in all SLSE dimensions except for the ‘PW’ dimension. However, no gender differences were found in the Taiwanese sample. The findings unraveled in this study were interpreted from a socio-cultural perspective in terms of the curriculum differences, societal expectations of science education, and educational policies in Singapore and Taiwan. [ABSTRACT FROM PUBLISHER]

One aim of environmental education is to enable people to make informed decisions about their environmental behaviour; this is particularly significant with environmental problems that are believed to be both major and imminent, such as climate change resulting from global warming. Previous research suggests no strong link between a person's general environmental attitudes and knowledge, and his or her willingness to undertake pro-environmental actions, so this study focuses on some specific issues. Using survey methods to produce quantitative data about students' beliefs concerning the usefulness of specific actions and their willingness to adopt them, novel indices have been constructed that indicate the potential of education to increase students' willingness to undertake those actions. The findings imply that altering a student's belief about certain issues will have little effect on their willingness to act. This can be because most students, even those with only a weak belief in the efficacy, are prepared to take action anyway. Conversely, it can be because a majority, including those convinced about the efficacy, are not prepared to take action. Education about such actions, where there is only a weak link between believed effectiveness and willingness to act, may be ineffective in terms of changing practice, because other factors such as social norms and situational influences dominate. For such actions other strategies may be required. For another set of actions, however, the benefits of education in changing practice seemed more positive; increasing recycling, reducing the use of artificial fertilisers and planting more trees are examples. [ABSTRACT FROM PUBLISHER]

Internet-based science learning has been advocated by many science educators for more than a decade. This review examines relevant research on this topic. Sixty-five papers are included in the review. The review consists of the following two major categories: (1) the role of demographics and learners' characteristics in Internet-based science learning, such as demographic background, prior knowledge, and self-efficacy; and (2) the learning outcomes derived from Internet-based science learning, such as attitude, motivation, conceptual understanding, and conceptual change. Some important conclusions are drawn from the review. For example, Internet-based science learning is equally favorable, or in some cases more so, to learning for female students compared to male students. The learner's control is essential for enhancing students' attitudes and motivation toward learning in Internet-based science learning environments. Nevertheless, appropriate guidance from teachers, moderators, or the Internet-based learning environment itself is still quite crucial in Internet-based science learning. Recommendations for future research related to the effects of Internet-based science learning on students' metacognitive reflections, epistemological development, and worldviews are suggested. [ABSTRACT FROM AUTHOR]

This study examines the relationship between the learning motivation and conceptual change of 127 eighth graders, after they have learned the acid, base, and salt concept in a digital learning context, designed according to the dual-situated learning model (DSLM). Two instruments—the students' motivation towards science learning (SMTSL) questionnaire and the acid-base-salt concept diagnostic test (CDT)—were used in the study. The questionnaire and the test were given to students in pre-test, post-test, and delayed post-test. Based on their motivation questionnaire scores, 18 students were selected from various scoring ranges for semi-structural interviews. Results showed that, after experiencing DSLM digital learning, students' post-CDT and delay-CDT scores were significantly higher than pre-CDT scores (p < 0.001, p < 0.01). Furthermore, Pearson correlation analysis indicated that students' conceptual change (ΔCDT) was significantly correlated with motivational factors such as self-efficacy (SE), active learning strategy (ALS), science learning value (SLV), achievement goal (AG), and learning environment stimulation (LES) (p < 0.05). Interviews also supported students' motivational correlation to ΔCDT, particularly for SE, ALS, and AG. [ABSTRACT FROM AUTHOR]

This study characterizes how learning and teaching differs as the responsibility for choosing curriculum goals and the strategies to reach those goals shifts between teacher and the students. Three different pedagogical approaches were used with 125 seventh-grade and eighth-grade students. All three curricula focus on electromagnetism, and were taught by two teachers in different schools over a two-week period. When students had control over the strategies employed to reach goals, their engagement stayed high. All three curricula advanced student understanding to some degree; however, large and significant gains were seen only for the pedagogy in which teachers set the specific learning goals and students had control over how to achieve them. Microdevelopment, a principle by which short-term learning recapitulates the stages seen in long-term developmental growth, is found to be a useful framework for curriculum development and for analyzing changes in student understanding. In general, initial "tinkering" activities are best followed by attempts at representing phenomena, only then to be followed by abstract conceptualization. On balance, we find that students benefit most from freedom to control the procedures that they generate in response to well-structured goals presented by the teacher. [ABSTRACT FROM AUTHOR]