Reasoning strategies used by students to solve stoichiometry problems and its relationship to alternative conceptions,prior knowledge,and cognitive variables

Achievement in science depends on a series of factors that characterize the cognitive abilities of the students and the complex interactions between these factors and the environment that intervenes in the formation of students' background. The objective of this study is to: a) investigate reasoning strategies students use in solving stoichiometric problems; b) explore the relation between these strategies and alternative conceptions, prior knowledge and cognitive variables; and c) interpret the results within an epistemological framework. Results obtained show how stoichiometric relations produce conflicting situations for students, leading to conceptual misunderstanding of concepts, such as mass, atoms and moles. The wide variety of strategies used by students attest to the presence of competing and conflicting frameworks (progressive transitions, cf. Lakatos, 1970), leading to greater conceptual understanding. It is concluded that the methodology developed in this study (based on a series of closely related probing questions, generally requiring no calculations, that elicit student conceptual understanding to varying degrees within an intact classroom context) was influential in improving student performance. This improvement in performance, however, does not necessarily affect students' hard core of beliefs.     

Can the Study of Thermochemistry Facilitate Students’ Differentiation between Heat Energy and Temperature?

The objectives of this study are: (a) Evaluate science major freshman students’ ability to differentiate between heat energy and temperature, after having studied the topic of thermochemistry; (b) ascertain the degree to which students resist change from the caloric to the kinetic-molecular theory; (c) study the ability to differentiate between heat energy and temperature and its relationship to solving a problem of thermochemistry. Science major freshman students (n = 76) were tested on a three-item Test of Heat Energy and Temperature (THT) and a Thermochemistry Problem (TP). Both THT and the TP formed part of a semester exam given after the topic of thermochemistry had been studied in class. Results obtained show that even after having studied thermochemistry in an introductory freshman course, students have considerable difficulty in differentiating between heat energy and temperature. Although, all three items of THT required the understanding of kinetic-molecular theory, percentage of correct responses varied considerably: Item 1 (72%), Item 2 (64%), and Item 3 (51%). A correct response on Item 3 meant that different amounts of water in two different vessels at 100 °C, would have the same average kinetic energy, but the heat energy required to attain 100 °C was different—hence the confusion with heat as a substance (caloric theory). It was found that students who had good conceptual understanding on the TP did not perform significantly (χ ² = 0.023) better on the THT. It is concluded that as science teachers we must be aware of the difficulties associated with the differentiation between heat energy and temperature and hence the need for teaching thermochemistry in order to facilitate conceptual understanding.     

Current Themes and Future Directions in Epistemological Research: A Commentary

This article summarizes and comments upon recent research on epistemological beliefs (i.e., beliefs about knowledge and knowing). I identify four emergent themes, outline directions for future research, and draw links between current theory and educational practice. The four themes pertain to the number relationship among, development, and measurement of epistemological beliefs. I address conceptual and methodological issues in future research. I also identify four educational implications: understanding teachers' beliefs, understanding students' beliefs, promoting critical thinking, and attempting to change teachers' and students' beliefs.     

Personal epistemology and relational pedagogy in early childhood teacher education programs

Over the last decade, research related to personal epistemological beliefs has offered insight into how to promote effective teaching and learning across educational settings. Personal epistemological beliefs reflect an individual's views about what knowledge is, how knowledge is gained, and the degree of certainty with which knowledge can be held. However, there has been no research that specifically investigates the relationship between such epistemological beliefs and early childhood practice. This paper draws together current research findings on epistemological beliefs and tertiary learning to provide a conceptual framework which can be used in early childhood teacher education programs to provide a basis for investigating early childhood teachers' understanding about their own learning and how they use this knowledge in their practice.     

Comparisons of beliefs about the nature of knowledge and learning among postsecondary students

The purpose of this study is to assess postsecondary students' beliefs about the nature of knowledge and learning, or epistemological beliefs. Comparisons were made between junior college students and university students and between technological science majors and social science majors on their degree of belief in simple knowledge, certain knowledge, innate ability, and quick learning. Junior college students were more likely to believe in simple, certain knowledge, and quick learning. University students were more likely to believe in innate ability. Technological science majors were more likely to believe in quick learning. Background variables, such as age, gender, and parental education, also contributed to differences between groups. Two-year institutions, as well as four-year institutions, might want to consider students' epistemological beliefs as possible factors affecting academic performance, attrition rate, and transfer difficulties.     

Epistemological Beliefs and Valuing School: Considerations for College Admissions and Retention

We examine the relationship between high school students' beliefs about the nature of knowledge, or epistemological beliefs, and their attitudes toward education. High school students completed an epistemological questionnaire assessing their beliefs in fixed ability to learn, simple knowledge, quick learning, and certain knowledge. Then they answered open-ended questions on a hypothetical character named Billy. They were to advise Billy if he should go on to college even though his grades were poor and his parents had no money. Finally, they completed questions about their own feelings toward high school and their expectations of the demands of college. Attitudes toward school were then regressed on epistemological belief factor scores. The less students believed in fixed ability to learn and quick learning, the more likely they were to encourage Billy to go to college and to appreciate the role of school in furthering their education, gaining employment, and living everyday life.     

Investigating the Relationships Among Elementary School Students’ Epistemological Beliefs, Metacognition, and Constructivist Science Learning Environment

The research questions addressed in this study were: what types of epistemological beliefs do elementary students have; what types of metacognition do elementary students have; and what are the relationships among students’ perceived characteristics of constructivist learning environment, metacognition, and epistemological beliefs. A total of 626 students enrolled in sixth, seventh, and eight grades of nine elementary public schools located in Ankara, Turkey constituted the participants of this study. Constructivist learning environment survey (CLES), Junior metacognitive awareness inventory (Jr. MAI), and Schommer epistemological belief questionnaire (EB) were administered to students. Factor Analysis of Jr. MAI revealed both knowledge of cognition and regulation of cognition items were loaded into one factor. Confirmatory factor analysis of EB revealed a four factor structure namely innate ability, quick learning, omniscient authority, and certain knowledge. Regression analyses revealed that metacognition and omniscient authority were significant predictors of personal relevance dimension of CLES. Metacognition was found as the only predictor of the student negotiation. Innate ability and metacognition significantly contributed to uncertainty. This study revealed that the elementary students with different mastery levels hold different epistemological beliefs and multi-faceted nature of elementary school students’ metacognition was seemed to be supported with this study. It was found that metacognition contributed to model more than epistemological beliefs for all three dimensions of CLES.     

Epistemic dimensions of students’ mathematics-related belief systems

Over the years, research on students’ epistemological beliefs has resulted in a growing common understanding but there are still some major points of discussion. Especially, the lack of consensus on the context-general and/or context-specific nature of epistemological beliefs deserves our attention.We argue that research in the field today is mainly characterized by a top-down approach that investigates students’ domain-specific beliefs from a general epistemological perspective. Alternatively, we report on one of our studies as well as some other research that takes a bottom-up approach starting from students’ domain-specific belief systems and analyzing their epistemic dimensions. Results of these studies point to the highly domain-specific nature of students’ beliefs about knowledge and knowing. Therefore, a conceptual distinction between students’ general epistemological beliefs and the epistemic dimensions of domain-related belief systems is recommended as a more appropriate way to address the context-general–context-specific discussion on epistemological beliefs.     

Examination of Changes in Prospective Elementary Teachers’ Epistemological Beliefs in Science and Exploration of Factors Meditating That Change

Epistemological beliefs refer to an individual’s thinking and beliefs about the nature of knowledge and knowing. The present study examined two research questions: (1) how do prospective elementary teachers’ epistemological beliefs in science change as a result of instruction specifically designed to improve their epistemological beliefs and (2) what role does the conceptual ecology for epistemological beliefs play in their development? The study was correlational with a sample of 161 prospective elementary teachers (148 female, 13 male). Self-report questionnaires tapping four dimensions of epistemological beliefs (certainty-simplicity, justification, source, attainability of truth) were given to prospective elementary teachers at two time points during an introductory science course. Results indicated that prospective elementary teachers became more sophisticated in their beliefs across all four dimensions of epistemological beliefs. It was found that one component of conceptual ecology for epistemological beliefs, thinking dispositions, was related to the development of epistemological beliefs. Prospective teachers with high thinking dispositions developed more sophisticated beliefs in comparison to prospective teachers with low thinking dispositions.     

Teachers Challenging the Status Quo in the Research Interview

Student teachers’ research is usually valued more for its contribution to their professional learning than for its contribution to the research topic itself. This paper reports on a research collaboration with eight student primary teachers in England, intended to build on a previously established project investigating young children’s epistemological beliefs. Analysis of the students’ written reports leads to an elaborated conceptual framework that draws attention to the need for a dialogue with all children about the interfaces experienced within, between and beyond each school context. The conclusions point to the distinctive research position held by student teachers in crossing boundaries between school and university contexts, and the particular relevance of the research topic for illuminating the out-of-school knowledge integral to children’s sense of self and learning.     

The impact of problem-based learning on engineering students’ beliefs about physics and conceptual understanding of energy and momentum

The purpose of this paper is to investigate the impact of problem-based learning (PBL) on freshmen engineering students’ beliefs about physics and physics learning (referred to as epistemological beliefs) and conceptual understanding of physics. The multiple-choice test of energy and momentum concepts and the Colorado learning attitudes about science survey were used to collect the data. The sample consisted of 142 students enrolled in the PBL and traditional lecture classes in the engineering faculty of a state university in Turkey. The analyses showed that the PBL group obtained significantly higher conceptual learning gains than the traditional group and the change (improvement) in the PBL group students’ beliefs from the pre- to post test were significantly larger than that of the traditional group. The results revealed that beliefs were correlated with conceptual understanding. Suggestions are presented regarding the implementation of the PBL approach.     

Exploring the factors related to acceptance of evolutionary theory among Turkish preservice biology teachers: Toward a more informative conceptual ecology for biological evolution

In this study, using multiple regression analysis, we aimed to explore the factors related to acceptance of evolutionary theory among preservice Turkish biology teachers using conceptual ecology for biological evolution as a theoretical lens. We aimed to determine the extent to which we can account for the variance in acceptance of evolutionary theory by using understanding of evolutionary theory, epistemological beliefs, thinking dispositions, and parents' educational level as independent variables. Preservice biology teachers' thinking dispositions, their understanding of evolutionary theory, and their parents' educational level are positively correlated with acceptance of evolutionary theory. We did not find any significant positive correlation between epistemological beliefs and acceptance of evolution because of low reliability coefficients of subscales of the epistemological beliefs instrument. Together they explained 10.5% of the variance. These results suggest that studying the relationship between acceptance of evolutionary theory and other related factors in a multivariate context is more informative than examining the relationship between acceptance of evolutionary theory and other factors in isolation. Our findings indicate that studying a controversial issue such as acceptance of evolutionary theory in a multivariate fashion, using conceptual ecology as a theoretical lens to interpret the findings, is informative. Our results suggest the inclusion of thinking dispositions in conceptual ecology for biological evolution. © 2007 Wiley Periodicals, Inc. J Res Sci Teach 45: 420–443, 2008     

The Concepts of Heat and Temperature: The Problem of Determining the Content for the Construction of an Historical Case Study which is Sensitive to Nature of Science Issues and Teaching–Learning Issues

Historical case studies of scientific concepts are a useful medium for showing how scientific ideas originate and how they change over time. They are thus a useful tool for conveying knowledge about the nature of science. This paper focuses on the concepts of heat and temperature and discusses some issues related to choosing the content for a historical case study which incorporates not only nature of science perspectives but understandings related to what we know about the teaching and learning of these concepts. The case study is designed for first-year university chemistry students as an introduction to their study of thermodynamics. The paper includes a general chemistry textbook analysis of the heat and temperature concepts and a discussion of the caloric theory of heat, thermometry, and a brief survey of how the energy concept transformed our understanding of heat and temperature.     

Conceptual Change from the Framework Theory Side of the Fence

We describe the main principles of the framework theory approach to conceptual change and briefly report on the results of a text comprehension study that investigated some of the hypotheses that derive from it. We claim that children construct a naive physics which is based on observation in the context of lay culture and which forms a relatively coherent conceptual system—i.e., a framework theory—that can be used as a basis for explanation and prediction of everyday phenomena. Learning science requires fundamental ontological, epistemological, and representational changes in naive physics. These conceptual changes take a long time to be achieved, giving rise to fragmentation and synthetic conceptions. We also argue that both fragmentation and synthetic conceptions can be explained to result from learners’ attempts assimilate scientific information into their existing but incompatible naive physics.     

Epistemological Beliefs Across Domains Using Biglan's Classification of Academic Disciplines

The purpose of this study was to examine students' beliefs about the nature of knowledge and learning, epistemological beliefs, across domains that vary according to Biglan's classification of academic disciplines (hard vs. soft disciplines and pure vs. applied disciplines). One hundred and fifty-two university students completed three questionnaires that assessed their epistemological beliefs about mathematics (hard-pure), the social sciences (also pure), and business (neither hard nor pure). Correlations indicated that students' epistemological beliefs were similar for mathematics and social sciences, as well as for mathematics and business. When the amount of academic experience was taken into account, some evidence of domain specificity was found. These results support Sternberg's caveat that the dichotomy of domain generality/specificity is an assumption that should be questioned. We propose that future researchers should investigate the breadth of applicability of epistemological beliefs.     

DOMAIN DIFFERENCES IN THE EPISTEMOLOGICAL BELIEFS OF COLLEGE STUDENTS

This study examined the differences in the epistemological beliefs of college students across major fields of study. Beliefs in fixed ability, simple knowledge, quick learning, and certain knowledge were assessed for 290 students attending a large urban public university. Major fields of study were classified in domains of study according to the hard-soft and pure-applied dimensions of Biglan's well-known classification of academic fields. Additional analyses examined the effects of gender, age, year in college, and GPA. Results indicated that students majoring in pure fields were less likely than those in applied fields to hold naive beliefs in simple knowledge, quick learning, and certain knowledge, and students majoring in soft or pure fields were less likely than others to hold naive beliefs in certain knowledge. Gender, age, and GPA were also related to students' beliefs. The results of this study suggest that students' beliefs about the nature of knowledge and learning are related to the disciplinary contexts in which students select and experience their specialized coursework in college.     

论学生学习观的结构

学生的学习观是学生个体对学习现象和经验的直观认识,对学习动机和行为具有重要作用。对于学生学习观的具体内涵和结构,研究者们分别侧重于学习观因素和层次两个角度加以阐述,但这些理论都是从对学生的调查结果中归纳出来的,而学生的学习观是一种内隐的直觉,学生未必能够明确而全面地描述出来。为了更好地揭示个体学习观的内涵,最好基于调查归纳研究的结果,参照学习理论家们对学习现象和经验的分析,同时从因素和层次两个方面来刻画学生个体的学习观。     

A rational reconstruction of the kinetic molecular theory of gases based on history and philosophy of science and its implications for chemistry textbooks

Research in science education has recognized the importance of history and philosophy of science. Given this perspective, the study was designed to develop a framework for examining the way in which chemistry textbooks describe the kinetic theory and related issues. The framework was developed by a rational reconstruction of the kinetic molecular theory of gases based primarily on the interpretations of Maxwell and Boltzmann, by historians and philosophers of science. Another aspect of the framework was based on an analysis of freshman chemistry students' performance on gas problems that required the use of algorithms or conceptual understanding. Subsequently, 22 textbooks were evaluated using a framework consisting of six criteria. Results obtained showed that most textbooks lacked a history and philosophy of science framework and did not deal adequately with the following aspects: (1) Postulates of the kinetic theory were speculative and played the role of simplifying assumptions, considered to be the rule in science rather than being the exceptions; (2) Based on these simplifying assumptions, the theorists built a series of tentative models that progressively incorporated the behavior of real gases; (3) Similar to other research programs in the history of science, Maxwell's was based on inconsistent foundations; (4) Development of the kinetic theory had to compete with chemical thermodynamics, a rival research program; (5) Maxwell and Boltzmann facilitated our understanding of gas behavior beyond the observable hydrodynamical laws, by explaining the internal properties (e.g., molecular collisions).     

Fostering radical conceptual change through dual‐situated learning model

This article examines how the Dual‐Situated Learning Model (DSLM) facilitates a radical change of concepts that involve the understanding of matter, process, and hierarchical attributes. The DSLM requires knowledge of students' prior beliefs of science concepts and the nature of these concepts. In addition, DSLM also serves two functions: it creates dissonance with students' prior knowledge by challenging their epistemological and ontological beliefs about science concepts, and it provides essential mental sets for students to reconstruct a more scientific view of the concepts. In this study, the concept “heat transfer: heat conduction and convection,” which requires an understanding of matter, process, and hierarchical attributes, was chosen to examine how DSLM can facilitate radical conceptual change among students. Results show that DSLM has great potential to foster a radical conceptual change process in learning heat transfer. Radical conceptual change can definitely be achieved and does not necessarily involve a slow or gradual process. © 2004 Wiley Periodicals, Inc. J Res Sci Teach 41: 142–164, 2004     

Relationship between teacher intentions and their classroom use of Superscience

Using the conceptual model of reasoned action, one would expect that what teachers do with instructional materials would be influenced by their internal beliefs and their external constraints. In this two-year study with elementary teachers, using a supplemental science instructional resource,Superscience, it was found that teachers' internal beliefs about what will benefit their students are linked to the external constraints of their students' interests and the expected curriculum. Even if the teachers believed that the content of the resource would be helpful, they were not likely to use it if they believed it did not fit the expected curriculum.