Pick a Number … Any Number?

A recent classroom revelation caused us to reconsider the adequacy of the instructions offered in our textbooks for one of our most elementary quantitative methods. Specifically, we found that many students were mystified concerning how to pick an initial objective function value when plotting an isoprofit line in order to graphically solve a linear programming problem. We observed that this seemingly insignificant issue was causing a surprising amount of wasted time, confusion, and even anxiety. Our experience indicated that students do not necessarily possess any consistent intuition for choosing an appropriate initial value. We confirmed this perception through informal experimentation. We reviewed several textbooks and found that most simply do not bother to address this issue. Therefore, we devised a simple, comprehensible method which we have taught our students to resolve or avoid this problem. Although we quickly found the method to be helpful for many students, we conducted an experiment to formally measure its effect.     

Developing a Research Agenda in Science Education

The Science Summit reinforced a question upon which many of us in science education are focused: How can we, the science education community of researchers, practitioners, and consumers, lead policy? We include a brief review of the No Child Left Behind Act and its implications for teachers, and elaborate about one ongoing and growing effort to answer the concerns about the paucity of research expressed at the Summit. We describe a unique and growing collaboration across professional science education and science organizations and societies that focuses on the development of a research agenda. The term ‘consilience’ refers to the “jumping together of knowledge” that leads to scientific advancements, progressive, creative, fluid scientific research and intellectual capacity to move a research community toward an enlightened research agenda. A coherent research agenda enables us to specify what we know, what we need to know, and how research can be employed for creating and implementing policy. The use of a dynamic organizer (such as Pasteur’s Quadrant) for a research matrix of topics provides a possible structure for organizing and cataloging research questions, designs, findings from past studies, needed areas for research, and policy implications. Through this unique collaboration, the science education community can better focus on needs and priorities and ensure that teachers, policy makers, scientists, and researchers in education at local through national levels have an important stake in research priorities and actions.     

汉语背景中文化、教育、职业和劳动概念的语源学分析

文化、教育、职业和劳动这四个概念,以及表达它们的汉字反映了劳动组织所植根的社会历史背景。因此,在汉语语境中对这几个概念进行语源学分析,了解其特定结构和形成过程,把握其蕴涵的精神实质,对于准确理解就业管理、职业世界和职业教育等都具有重要意义。     

A content analysis of research published in the Journal of Research in Science Teaching from 1985 through 1989

To determine if actual practice was consistent with commonly recommended research methods and procedures, this study examined 130 studies reported over a 5-year period in three volumes of the Journal of Research in Science Teaching (JRST). The results were consistent with similar previous analyses (Shaver & Norton, 1980a, 1980b; Wallen & Fraenkel, 1988a) and indicate that appropriate generalizations beyond the confines of the reported studies may be impossible for most (64%) of the JRST studies surveyed. The findings also show that replication studies, which could be employed to offset deficiencies in generalizability, were not commonly encountered (3%) in these 130 reports. In addition, the study results indicate that many researchers (48%) do not properly restrict their conclusions based on the limits imposed by the accessible populations and samples used; nor do they typically provide possible alternative explanations for the outcomes obtained (76%). These findings prompt the following recommendations: 1. A greater awareness and use of replication as a check on generalizability should be encouraged by the science education community. 2. Clearly defined populations (target and accessible) and fully described samples warrant increased attention as report components from authors, reviewers, and editorial board members of JRST. 3. In light of the difficulties inherent in effecting random selection in educational settings, a greater emphasis should be placed on recognizing the limits that the underlying assumptions of inferential statistics place on research conclusions. The results of this study indicate that the methodological quality of published science education research should remain a concern for both practitioners and readers.     

Effects on children's achievement and curiosity of variations in learner control over an interactive video lesson

The purpose of this study was to evaluate the effectiveness of variations in learner control on children's level of curiosity and learning from computer-based interactive video (CBIV). The content was presented as a videodisc visit to an art museum and contained both facts and concepts. A posttest-only control group design was employed with 101 first-and second-grade subjects randomly assigned to one of three experimental conditions—Program Control, Learner Control, Learner Control with Advisement—or a control group. The dependent variables were achievement and three measures of curiosity. Children in the Learner Control with Advisement group scored significantly higher on the achievement posttest than the Learner Control subjects or control group. No differences were found between the Program Control and either of the Learner Control groups. For the curiosity measures, the Learner Control with Advisement subjects scored significantly higher than the control group on Content Exploration, and the subjects in the control group scored significantly higher than those in the Program Control group on Persistence.     

Stichwort: PISA-E

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