Preordained science and student autonomy: the nature of laboratory tasks in physics classrooms

The central question facing humankind is 'What kind of society are we to have?' We argue that in order to begin to answer this question, citizens need to recognize that one of the driving forces determining our society is that science is a human social activity like any other. This flies in the face of much of the rhetoric and ideology about science - the stories and myths of formal and informal education. We wish to encourage both a socially responsible science and a public mindful of its strengths and weaknesses. We explore two case studies to illustrate our concerns. These are the construction of knowledge about Acquired Immune Deficiency Syndrome (AIDS), and the social construction of safety standards for exposure to low-level ionizing radiation. These two health-related controversial scientific issues illustrate the problematic nature of much of science and the implications for the public at large.     

A Conceptual Change Approach to Learning Science

Summaries

English

Learning science is complex‐‐a student has at different times to acquire new information, reorganize existing knowledge and even discard cherished ideas. In addressing this issue, the analogy between individual learning and conceptual change in scientific disciplines has been fruitful in providing aspects of a suitableframework for analysing science learning. In this paper a model of learning as conceptual change is developed. It investigates the conditions under which an individual holding a set of conceptions of natural phenomena, when confronted by new experiences will either keep his or her conceptions substantially unaltered in the process of incorporating these experiences, or have to replace them because of their inadequacy. The model illuminates the importance of addressing an individual's existing conceptions. It also pinpoints the importance of an individual's metaphysical commitments in influencing scientific learning.     

The use of schema theory in the design of instructional materials: A physics example

What are the implications of cognitive science for the design of instructional materials given its central concern with meaningful learning? This question was addressed during an attempt to improve the quality of learning in an introductory non-calculus college physics course where a major intellectual problem that many students face is the development of a coherent view of the information provided to them. The absence of a conceptual framework may contribute to the rapid loss of information often observed among many students shortly after their taking a test. Lack of a conceptual framework also may account for the frequent use of trial-and-error approaches to using formulae. This report cites the use of schema theory for the development of a generative schema or a set of schemas that could be used by students to integrate all of the physics content, and for the design of a means for representing and teaching the schema(s) in a set of instructional materials.     

Effect of instruction using microcomputer simulations and conceptual change strategies on science learning

This article describes an investigation into the effects of instruction using microcomputer simulations and conceptual change strategies. The microcomputer program was designed in accord with a model of conceptual change to diagnose and remediate an alternative conception of velocity. Results show that, first, the microcomputer simulations are credible representations of reality, and second, that the remedial part of the program produced significant conceptual change in students holding the alternative conception.     

Determining the conceptions of teaching science held by experienced high school science teachers

The article describes the process of analysis for determining a teacher's conception of teaching science using an available interview task. The analytical process provides a transparent link between teachers' spoken words and the different representations of their conceptions of teaching science. Representations of a teacher's conception of teaching science include a grid for analyzing different themes in a teacher's conception, a brief summary of the themes, and a longer written interpretive summary. Because these representations are based on the fundamental components of teaching science, they allow the uniqueness of both specific and structural aspects of teachers' views to emerge, and they facilitate comparisons between teachers. The analysis and its outcomes are exemplified using interviews with several experienced high school science teachers.     

Dichotomy in thinking,dilemma in actions: Researcher and teacher perspectives on a chemistry teaching practice

This article is a case study of the thinking and actions of Mr. Corrigan, an experienced high school chemistry teacher. We explored Corrigan's ideas on teaching science by conducting two types of interviews, and wrote a case summary for Corrigan to read that compared his ideas with our classroom observations. We described his practice as centering on structured classroom and laboratory time, and contrasted it with his emphasis on students' exploratory thinking in the interviews. Corrigan's reflections on the case summary revealed a set of tacit conceptions of teaching science centered on the necessity of having a highly organized classroom and laboratory to ensure students' content understanding and success on tests and in college. We felt Corrigan faced a dilemma in that he values both his control of learning activities and the students' learning through exploration. Corrigan was confident in his practice and did not see much of a dilemma, and felt he was attending to both aspects of his thinking in an adequate fashion. Corrigan's reflections on the case summary are presented as a commentary on our perspective of the relationship between his thinking and actions. Working with Corrigan revealed to us the complexity of characterizing a teacher's thinking and its relationship to actions, and the value of the insight researchers gain from discussing their conclusions with the teacher. © 1997 John Wiley & Sons, Inc. J Res Sci Teach 34: 239–254, 1997.     

Practices influenced by policy? An exploration of newly hired science teachers at sites in South Africa and the United States

In many parts of the world, newly hired science teachers’ practices are developing in a complex policy environment. However, little is known about how newly hired science teachers’ practices are enacted throughout a cycle of instruction and how these practices can be influenced by macro-, meso-, and micro-policies. Knowing how policies impact practice can result in better policies or better support for certain policies in order to enhance the instruction of newly hired teachers. This comparative study investigated how 12 newly hired science teachers at sites in South Africa (SA) and the United States (US) progressed through an instructional cycle of planning, teaching, and reflection. The qualitative data were analysed through beginning teacher competency frameworks, the cycle of instruction, and institutional theory. Data analysis revealed prevailing areas of practice and connections to levels of policy within the instructional cycle phases. There were some differences between the SA and US teachers and among first-, second-, and third-year teachers. More importantly, this study indicates that newly hired teachers are susceptible to micro-policies and are progressively developing their practice. It also shows the importance of meso-level connectors. It suggests that teacher educators and policy makers must consider how to prepare and support newly hired science teachers to achieve the shared global visions of science teaching.     

Conceptions over time: Are language and the here-and-now up to the task?

Is it possible to explain students’ conceptions of natural phenomena purely in terms of the interactions between two people and the language they use during an interview? I argue that this hypothesis cannot be accepted on several grounds. First, contextual factors prior to the interview influence the course of its events, and that these in turn influence future events. Second, people have agency over their interactions and the ability to use language creatively in ways that a strong version of language preordination inherent in this hypothesis would not permit. Third, people bring language fluency and ideas to an interview that allow them to grapple with phenomena and issues they might not have previously considered, and formulate conceptions that they can and do use in future interactions. In addition, I argue that the field of science education is able to consider curricular and instructional issues relating to students’ conceptions without resorting to the extremes of cultural relativism or intellectual imperialism, and that conceptual change theory addresses both the processes and outcomes of students’ interactions.