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1.
Facilitating Changes in Ninth Grade Students’ Understanding of Dissolution and Diffusion through DSLM Instruction 总被引：1，自引：0，他引：1
Hsiao-Ching She 《Research in Science Education》2004,34(4):503-525
This study examines the nature and process of ninth grade students conceptual change regarding their mental model of dissolution and diffusion as a result of instructions using the Dual Situated Learning Model (DSLM). The dual situated learning events of this model are designed according to the students ontological viewpoint of the science concepts as well as the nature of these concepts. Moreover, these events serve two functions by creating dissonance with the pre-existing knowledge and providing new schema for constructing a more scientific view of the concept. The concepts of dissolution and diffusion were chosen to examine students conceptual change process because they involve the understanding of both invisible and process attributes. Results indicate that about 76%–90% of the students successfully underwent a change in their understanding of the concepts of dissolution and diffusion after instruction using dual situated learning events. Moreover, about 75% of the students successfully applied their previous mental sets into the challenging situated learning event. This current study demonstrates that DSLM indeed facilitates the processes of conceptual change and knowledge acquisition involving concepts of dissolution and diffusion, clarifying the nature of conceptual change involving science concepts of both an invisible and a process nature. 相似文献
2.
This study has reviewed the last two decades of student conception research in solution chemistry pertaining to aims, methods of exploring students conception, general knowledge claims, students conceptions and difficulties, and conceptual change studies. The aims of solution chemistry studies have been to assess students understanding level of solution chemistry and in some studies compare understanding based on age and year at school or college. The methods of exploring students conceptions consisted of interviews, paper and pencil surveys (open-ended questions and multiple-choice questions), free writing and drawings and the validity of these methods have been highlighted. The general knowledge claims synthesized in this study are students (a) attending to mechanical events, (b) preference for everyday language usage over chemical language, (c) confusing solution chemistry with non-related concepts, (d) lack of sub-microscopic explanation for macroscopic observation, (e) difficulty with visualizing and representing sub-microscopic ideas, (f) difficulty with symbolic representations, (g) inconsistent explanations, (h) development of student understanding with age, and (i) development of conservation reasoning with age. To incorporate students conceptions, conceptual change studies have used strategies such as worksheet, analogy, collaboratively working with a teacher, hypermedia, and group exploration. The results of conceptual change studies generally have had a positive impact enabling students to consider their ideas and develop plausible models of solution chemistry. For improvement of student learning in chemistry, this review of solution chemistry studies sheds light on teacher thinking and capacity building with respect to explicitly incorporating students conceptions into chemistry curriculum; practicing research-based strategies; forging links among types of chemical knowledge; collaborating for experimental teaching; and conducting further research. 相似文献
3.
summary This article presents a case study class response to Mildred Taylors now classic and widely read novel, Roll of Thunder Hear My Cry. Through data collected during one school year, the ways urban, adolescent students use their contemporary lenses to interpret the literary theme of confronting, overcoming and challenging racism are discussed. The participants responses are organized into four reader response categories that explicate the complex and interactive interpretations developed by the children while reading the novel. In addition to providing insights about the participants textual understanding, pedagogical findings indicate that the book can also be used to explore the nature of racism while creating a safe space to confront and more deeply understand racisms impact on the past as well as the students current reality. 相似文献
4.
The implications of history and philosophy of chemistry are explored in the context of chemical models. Models and modeling provide the context through which epistemological aspects of chemistry can be promoted. In this work, the development of ideas and models about acids and bases (with emphasis on the Arrhenius, the Brønsted–Lowry, and the Lewis models) are presented. In addition, misconceptions (alternative and instructional ones) on acid-base (ionic) equilibria are examined from the history and philosophy of science perspective. The relation between the development of the models and students misconceptions are investigated. Finally, the hypothesis that history and philosophy could help educators anticipate students misconceptions is examined. 相似文献
5.
This study is intended to develop an assessment instrument to investigate students understandings about internal transport in plants and human circulatory system. A refined process of a two-tier diagnostic test was used to develop the instrument. Finally, three versions of the Internal Transport in Plants and the Human Circulatory System test were developed for different educational levels: elementary, secondary and high school level. The test–retest reliability, the degree of difficulty, and the range of discrimination were found to be reasonable for all three versions. The statistical variances across educational levels of the verification samples and the test applications are discussed. The students major alternative conceptions on internal transport of plants and human were classified into three attributes of explanations: interconnectedness, language and anthropomorphism. Based on the nature of students explanations, card-sorting with justification, learning cycle and concept mapping were recommended for in-depth learning of the concept. 相似文献
6.
Matthew Kearney 《Research in Science Education》2004,34(4):427-453
This paper focuses on the use of multimedia-based predict–observe–explain (POE) tasks to facilitate small group learning conversations. Although the tasks were given to pairs of students as a diagnostic tool to elicit their pre-instructional physics conceptions, they also provided a peer learning opportunity for students. The study adopted a social constructivist perspective to analyse and interpret the students conversations, focussing on students articulation and justification of their own science conceptions, clarification of and critical reflection on their partners views, and negotiation of new, shared meanings. Two senior science classes participated in this interpretive study. Data sources were mainly qualitative and included audio and video recordings of students small group discussions at the computer, interviews with selected students and their teachers, classroom observations, and student surveys. Findings indicate that the computer-based POE tasks supported students peer learning conversations, particularly during the prediction, reasoning and observation stages of the POE strategy. The increased level of student control of the POE tasks, combined with the multimedia nature of the program, initiated quality peer discussions. The findings have implications for authentic, technology-mediated learning in science. 相似文献
7.
Shu-Nu Chang Mei-Hung Chiu 《International Journal of Science and Mathematics Education》2005,3(1):117-140
Scientific literacy and authenticity have gained a lot of attention in the past few decades worldwide. The goal of the study was to develop various authentic assessments to investigate students scientific literacy for corresponding to the new curriculum reform of Taiwan in 1997. In the process, whether ninth graders were able to apply school knowledge in real-life problems was also investigated. Over the course of our two-year study, we developed authentic assessments to investigate a stratified random sampling of 1,503 ninth graders levels of scientific literacy, including scientific cognition, process skills, application of science, habits of mind, nature of science, and attitude towards science. The purpose of this article is to discuss three different formats of authentic assessments: multiple-choice, open-ended, and hands-on test items, which we developed to investigate scientific cognition. To validate the three formats of authentic assessments, students performance on these three assessments were compared with the science section of Taiwans Academic Attainment Testing (STAAT), and the values of Pearson correlation coefficient were all at the significant level, ranging from 0.205 to 0.660 (p<0.01). We found that our three authentic assessments were better in evaluating students authentic abilities in science than standardized tests (such as STAAT). Further authentic assessments, particularly the hands-on activity, benefited low-achieving students. Concerning the common themes tested in the authentic assessments, students performed better in a multiple-choice test than an open-ended test on electricity and heat and temperature. In addition, two themes of chemical reactions and reactions of acid and base with indicators were performed best in a hands-on test than in the other two tests. In this article, we provide evidence that authentic assessments could be developed in different formats to investigate students scientific cognition as part of the national test. Of these formats, the multiple-choice, open-ended, and hands-on test items are all shown to be sensitive in their evaluation of students cognition in science. 相似文献
8.
This study explores the use of Valsiners zone theory as a way to interpret the zones of proximal development of three secondary teachers in mathematics and science. Specifically, we used classroom discourse to identify what the participating teachers promoted (zone of promoted action) or allowed (zone of free movement) in the classroom as a way to understand better their potential for development. We found that teachers who promoted actions or events that they ultimately did not allow students to experience seemed to be at a point in their development analogous to Vygotskys pseudo-conceptual stage, prior to full concept formation. Moreover, we found that, at this illusionary zone, the teachers capacity to listen actively to students thinking seemed to affect the teachers transition toward more inquiry-based forms of practice. We concluded that understanding the zone of promoted action and the zone of free movement the teacher organizes in the classroom can indicate the existence or absence of an illusionary zone and thereby provide insight into a teachers potential for development. 相似文献
9.
This study involved the development and application of a two-tier diagnostic test measuring students understanding of flowering plant growth and development. The instrument development procedure had three general steps: defining the content boundaries of the test, collecting information on students misconceptions, and instrument development. Misconception data were collected from interviews and multiple-choice questions with open response answers. The data were used to develop 13 two-tier multiple-choice items. The conceptual knowledge examined was flowering plant life cycles, reproduction, precondition of germination, plant nutrition, and mechanism for growth and development. The diagnostic instrument was administered to 477 high school students. The correlation coefficient of test-retest was 0.75. Difficulty indices ranged from 0.24 to 0.82, and discrimination indices ranged from 0.32 to 0.65. Results of the Flowering Plant Growth and Development Diagnostic Test suggested that students did not acquire a satisfactory understanding of plant growth and development concepts. Nineteen misconceptions were identified through analysis of the items that could inform biology instruction and resource. 相似文献
10.
The purpose of this paper is to identify the factors that predict students perceptions of their institutions success in achieving a positive climate for diversity. This study examines a sample of 544 students at a large, public, predominantly White Mid-Western institution. Results show that students perceptions of the institutions ability to achieve a positive climate for diversity is a reflection of students precollege interactions with diverse peers and the institutions ability to incorporate diversity-related issues into its curriculum. Results also indicate that these perceptions differ by race and gender. Implications for institutional researchers are discussed. 相似文献
11.
Chorng-Jee Guo Huey-Por Chang 《International Journal of Science and Mathematics Education》2004,2(4):435-453
The new Science and Technology Curriculum Framework recently issued in Taiwan advocates the teaching of integrated science and technology with greater emphasis on basic skills. Science teachers are not used to teach in this way, they need different abilities and skills in order to do so. Using various effective professional development strategies, including a collaborative action research approach, the aim of this study was to help science teachers develop professionally through the development of instructional modules on integrated science and technology. A research team was formed consisting of science educators/researchers, graduate assistants and science teachers from six junior high schools in the central area of Taiwan. In order to involve teachers collaboratively over an extended period of time, the entire study went through preparatory, elaborative and disseminative stages for three consecutive years. Various professional development opportunities were built-in. The instructional modules developed were discussed by participants of this study and evaluated by external experts before they were tried out in actual classroom settings. Both qualitative and quantitative methods, including field notes, interviews, observations, video-taping, audio-taping, document analysis, and surveys of students and teachers opinions were used to collect data for a closer examination of the effectiveness of the instructional modules and of the increase in teachers instructional proficiencies. Overall, teachers interdisciplinary experiences and knowledge increased. They were more flexible and resourceful in using instructional strategies that best fit the instructional settings. Their knowledge and skills in using information and communication technologies in science classrooms also increased considerably. 相似文献
12.
This study examined the interaction between college students attachment orientation and mentors relational style in the prediction of students behaviors and perceptions in academic mentoring and of their subsequent academic achievement. Ninety college students were administered the Adult Attachment Interview and their professors-mentors completed the Attachment Style Questionnaire. Students displayed more adaptive behaviors and perceptions in mentoring and earned higher grades when their attachment orientation was in contrast to their mentors relational style. Implications for the practice of academic mentoring in college are discussed. 相似文献
13.
The seminal influence of Kuhn's The Structure of Scientific Revolutions on the history, philosophy, and sociology of science illustrates how changes in pedagogical demands can significantly alter patterns of research. Kuhn's book was honed as a teacher in the General Education of Science curriculum designed by Harvard President James Bryant Conant, to whom Structure is dedicated. The courses targeted non-scientists who would have to make policy decisions in the dawning Atomic Age, where science would play an increasing role, despite the public skepticism generated by the atomic bomb (which Conant administered). Conant wanted these future policymakers to be connoisseurs of science who understood problematic Big Science as continuing the basic mindset of culturally valued Little Science. This partly explains why Kuhn presented science as following the same stages, regardless of the specific science and period under discussion. I consider three other senses in Conant's curriculum left its imprint on Kuhn's research practice: the use of case histories to manufacture the internal/external history distinction; the invention of the historiographical mirage known as normal science; the application of the incommensurability thesis to create a more receptive attitude to past scientists. 相似文献
14.
Denise Whitelock Daniela Romano Anne Jelfs Paul Brna 《Education and Information Technologies》2000,5(4):277-289
One of the advantages of building a virtual reality system is that it allows students to enter new worlds which in these instances include trips to the bottom of the Atlantic Ocean, a field visit to an Oak Wood and a close encounter in a 3D maze. In all these environments the factors affecting a sense of being there or presence was investigated. Enhanced audio feedback increased a subjective sense of presence but did not increase students' conceptual learning scores. We have also found that a sense of social presence enhanced the notion of being there together with measures of collaboration. However being there can take its toll on students and our findings suggest it imposes a cognitive overload. Where students have a choice, they try and reduce this overload by asking for conceptual tools to assist them in their learning tasks. The studies reported in this paper provide some benchmark data about these issues which deserve further investigation if we are to design effective virtual environments for conceptual learning. 相似文献
15.
Understanding: ‘Knowledge’, ‘Belief’ and ‘Understanding’ 总被引：1，自引：0，他引：1
The following paper is intended as an exercise in friendly criticism of one of Harvey Siegel's and Mike Smith's (Knowing, Believing and Understanding, this volume). I'm in substantial sympathy with the general thrust of their paper and my remarks merely provide some criticism of their discussion's conceptual coherence and clarity and a correspondingly slightly adjusted version of what they have to say. My focus is limited to the conceptions of knowledge, belief and understanding and their inter-relationships in terms of which they offer suggestions to science educators. 相似文献
16.
There is a growing interest in the mathematics education community in the notion of abstraction and its significance in the learning of mathematics. Reducing abstraction is a theoretical framework that examines learners behavior in terms of coping with abstraction level. It refers to situations in which learners are unable to manipulate concepts presented in a given problem; therefore, they unconsciously reduce the level of abstraction of the concepts involved to make these concepts mentally accessible. This framework has been used for explaining students conception in different areas of undergraduate mathematics and computer science. This article extends the applicability scope of this framework from undergraduate mathematics to school mathematics. We draw on recently published research articles and exemplify how students behavior can be described in terms of various interpretations of reducing abstraction level. 相似文献
17.
Carol K.K. Chan 《Instructional Science》2001,29(6):443-479
This study investigated the effects of peer collaboration anddiscourse patterns on conceptual change in the context of high-schoolstudents learning from incompatible scientific information. The domainof investigation was biological evolution. Participants included 108students from Grades 9 and 12 randomly assigned to four conditions: (1)peer-conflict; (2) individual-conflict; (3) peer-assimilationand (4) individual-assimilation. Students were asked to think aloud ordiscuss with their peers eight statements consisting of scientificinformation ordered in ways that either maximized or minimized conflict.Several measures of prior knowledge and conceptual change were obtained.Peer collaboration resulted in some mixed findings suggesting that peereffects may vary depending on collaborative interactions. In-depthanalyses of collaborative interactions indicated two discourse patterns:surface moves included rating, ignoring, rejecting, and patching toeliminate differences; problem-centred moves involved problemrecognition, formulation of questions, and construction of explanations.Comparisons between successful and unsuccessful learners showedsignificant differences in their proportional use of surface andproblem-centred moves. External conflict did not lead to deeperdiscourse and more conceptual change; students may need toexperience meaningful conflict. These findings suggest why peercollaboration only works sometimes and indicate the importance ofhelping students to engage in productive discourse. 相似文献
18.
This study reports on teaching practices in science classrooms of Indonesian lower secondary schools in rural areas. Using six schools from three districts in the province of Kalimantan Selatan as the sample, this study found that most teaching practices in science classrooms in rural schools were teacher-centred with students copying notes. However, the study also found unique teaching practices of an exemplary science teacher whose teaching style can be described as both student-centred and teacher-centred, with students encouraged to be active learners. Four features of exemplary teaching practices were identified: The teacher managed the classroom effectively; used a variety of questioning techniques; employed various teaching approaches instead of traditional methods; and created a favourable learning environment. Data from classroom observations, interviews with teachers, and students responses to a questionnaire were used to compare the exemplary teacher and his colleagues. This study identified internal factors that may affect teaching practices such as a teachers content knowledge and beliefs about teaching. Compared to the other teachers, the exemplary teacher possessed more content knowledge and had a relatively stronger belief in his ability to teach. 相似文献
19.
Findings are presented from an ongoing study of three final-year, honours-level course units in the biosciences with a combined intake of 85 students. The data on which the analysis draws comprise semi-structured interviews with students together with findings from an Experiences of Teaching and Learning Questionnaire. The investigation forms part of a wider project concerned with the enhancement of teaching–learning environments in undergraduate courses in contrasting subject areas. The findings presented in the paper focus on two interrelated aspects of the students experiences within the teaching–learning environments represented by the three course settings. First, salient aspects of high-quality undergraduate-level learning are identified in the form of the students evolving grasp of characteristic ways of thinking and practising in the subject. These ways of thinking and practising in the biosciences were evident in the students engagement with the research literature and with experimental data, and in their efforts to master the requirements and conventions of the subject for written and oral discourse. The second part of the analyses focuses on the teaching–learning environments represented by the three course settings. It was found that, despite taking markedly different forms in the three settings, the teaching–learning and assessment strategies pursued appeared to be broadly congruent with the promotion of ways of thinking and practising in the subject. The quality of feedback to students also seemed pivotal, but needed to be understood in terms of the interplay of various factors, including opportunities for intrinsic as well as extrinsic feedback. Finally, the later years of undergraduate studies had called for a significant process of adjustment on the students part to a step-change in study demands. 相似文献
20.
There are considerable differences among mathematics teachers with regard to the quatlity of their way of developing mathematical knowledge in the classroom. Such differences are analysed. To develop mathematical meaning requires both a consistent presentation of the mathematical symbols and of the referential meaning of these symbols with respect to the given task. On the basis of this conception we assume that the quality of teaching will differ according to how teachers cope with the relation between these two sides of meaning. From a sample of 26 teachers, an expert teacher and a non-expert teacher were selected by means of classroom observation with scales of instructional quality variables. For each of these two teachers, two lessons introducing probability (sixth grade) are analysed. For this purpose, teacher and student contributions are coded. For the expert teacher, graphic visualizations of the development of mathematical concepts across time show soft transitions between the different aspects of mathematical meaning. These transitions are made possible by a consistent explication of the relation between formal symbols and the given mathematical task. In the case of the other teacher, explication of the relationship between the object side and the symbol side of mathematical meaning is much rarer, and there are sudden switches from one aspect of meaning to another. Further differences concern the handling of student contributions.We gratefully acknowledge the help of Wolfgang Barz, Regina Dietrich and Claudia Krüger with recording, transcribing or coding lessons. For their comments on draft versions of the paper the authors thank Deborah Ball, Jere Brophy, Willibald Dörfler, Alexander Gruza and two anonymous reviewers. 相似文献