Children's ideas about evaporation

This article reports on research conducted as part of the Primary Science Processes and Concept Exploration (space) Project. The background to, and orientation of, space is briefly described.

Classroom‐based research into children's thinking about evaporation is reported. This work was conducted in close collaboration with teachers of the 5‐11 years age range with the intention of establishing the viability of the techniques for eliciting ideas and managing subsequent interventions within classrooms.

Children's thinking in relation to three main evaporation phenomena are discussed. Ideas about evaporation were categorized by reference to notions of conservation, change of location and change of form of the water.     

Children's ideas about action at a distance

Children's ideas about action at a distance are analysed according to the commonsense theory. These ideas can be organized around three presuppositions which express concrete realizations of the abstract idea of interaction at a distance. The presuppositions are concerned with the uniqueness of earth, the need for connection between objects interacting at a distance, and how various forces support and focus each other. These ideas do not form a self‐consistent set of axioms to be applied coherently, but rather form a guiding framework. The chosen presuppositions are context dependent and related to the different environments of earth, a satellite, the moon and outer space. Support is preferred over connection. The relevance of these findings for instruction are discussed.     

Children's ideas about the reliability of experimental data

This paper reports some of the findings of the Procedural and Conceptual Knowledge in Science (PACKS) project. It documents children's ides about the reliability of experimental data, an important element of their understanding of science procedures. These ideas were elicited using a written survey instrument completed by over 1000 students aged 11, 14 and 16, chosen to be representative of the full ability range. The results show progression with age in understanding of empirical data. A range of ideas about the function of repeat measurements, how to handle repeat measurements and anomalous readings, and the significance of the spread of a set of repeated measurements emerge and are discussed.     

Children's choice of drawings to communicate their ideas about technology

This study examines children's choice of drawing to communicate their understanding of the concept “technology”. The study explored whether the children's drawings accurately reflected the depth and range of their understanding of technology in a way that was interpretable by others. Data were collected from 314 primary school children in England and 745 children in Western Australia. Children were invited to demonstrate their knowledge and understanding about technology by responding to a writing/drawing activity and a representative subsample were then interviewed about their responses. About two-thirds of children's responses to the activity included drawings. Children held a wide range of ideas about technology and only rarely was a drawing difficult to interpret. Although overall the drawings reflected the range of children's ideas, sometimes they did not reveal the depth or breadth of an individual child's understanding. Consistent with the ideas represented in the drawings, the interviews found that younger children held simpler ideas about technology, while older children held more complex, and sometimes quite abstract concepts of technology. A notable difference between the two countries was the emphasis on “design and make” and a smaller proportion of no response in the English sample, reflecting the greater length of time technology education has been implemented in England compared to Western Australia.     

Children's ideas about ecology 1: theoretical background,design and methodology

Abstract

This paper provides an introduction to a study of the ecological understandings of children aged 5‐16 years in schools in the north of England. Children's ideas about selected ecological concepts were elicited through a series of written tasks and individual interviews set in a range of contexts, referred to here as probes. Responses of about 200 pupils, across the age range, were obtained on each probe. In this paper, issues relating to theoretical background, design and methodology are outlined. Two further papers present the major findings of the study: the first reports children's ideas about the cycling of matter between organisms and between organisms and the abiotic environment (Leach et al. in press a); the second reports children's ideas about the interdependency of organisms in ecosystems (Leach et al. in press b).     

Children's observations,ideas, and the development of classroom theories about light

The purpose of this study was to examine the interaction between children's observations of light and shadows and their developing theories in the context of a series of lessons in a third-grade classroom. Detailed analysis of videotapes of the children's discussions of their investigations into light and shadows led to the finding that the children's observations of light led to the development of a limited theory about light that was largely useful in explaining classroom investigations. However, this theory of light was less helpful in helping them understanding shadow phenomena and was too limited to explain out-of-classroom observations of light and shadows.     

Children's ideas on light and vision

This paper reports a small‐scale longitudinal enquiry into the development of children's ideas on light and vision. It followed the same class from Year 4 (age 9) through to Year 6 (age 11), but the greater part of the information came from Year 5. The data were derived from the children's drawings and written responses, and from small group interviews. Care was taken to ensure that the ideas elicited were the true beliefs of the children. No formal instruction in the subject had been given, nor was any attempted. In the analysis, the children's views have been classified according to a hierarchical set of models, which reflect the strong adherence to an active vision interpretation held by the majority. The extent of progression towards the more scientific view is reported. In the introduction and discussion comparison is made between contemporary non‐scientific conceptions of vision, and the speculations of pre‐scientific philosophers. A final section presents some implications of these findings for teaching the topic.     

The mind is not a black box: Children's ideas about the writing process

We studied children's conceptions of the writing process while the complex cognitive activity of writing is carried out through a pictorial representation of the writing process. Sixty children attending Kindergarten, first grade and fourth grade in Bariloche, Argentina, were presented individually with a sequence of four questions about the content of a child's thought at four key moments of writing production (anticipating, writing, revising, rereading), which were depicted on picture cards. Textual analysis, the application of Simple Correspondence Factorial Analysis (SCFA) and Modal Response procedures, indicated significant developmental changes in the focus of children's ideas about writing. More specifically, we looked at children's conceptions of the nature of thinking while writing, given cognitive processes of increasing complexity and internalization. Main educational implications indicate the need to rethink practices for teaching writing at initial and primary school levels in order to promote teaching interventions directed at getting pupils to be explicit, revise and redescribe their conceptions about the writing process. We suggest that learners' conceptions of writing processes outline a tacit learning curriculum of writing, which operates by guiding learning efforts and self-evaluation standards.     

物流实验室的建设构想

目前,物流在我国得到了较好地发展,如何将物流教育与市场需求紧密结合,培养出能够将理论与实践相结合的物流专业人才,已成为现代物流教育所面临的紧迫问题,构建符合社会需要和学校发展的物流实验室是解决这个问题的关键所在。     

Exploring student ideas about biological variation

ABSTRACT

An understanding of biological variation is important for understanding ecological interactions, ecosystem function, and species’ response to environmental change. Biological variation is essential to species survival because natural selection acts upon the phenotypic variation within a population: the more varied the population’s genetic resources, the more likely that the population will persist into the future. We explored how students think about biological variation by evaluating written assessments and interviews of grades 6–16 students about starting a captive breeding programme for species conservation. We created a qualitative framework that describes levels of proficiency in student ideas about biological variation. Lower level responses reason about attributes related to an individual’s reproduction and survival rather than population-level variability. Student responses at a middle level of sophistication point to the importance of variation but do not link it mechanistically to species survival and resilience. We also describe alternative conceptions related to biological variation and natural selection which exist at all grade levels. Educators can use these findings to inform curriculum and instruction in terms of addressing important concept areas (e.g. variation at the population scale) and some common alternative conceptions that may impact an accurate understanding of natural selection and evolution.     

曹丕"文气说"的几点生发

曹丕的"文气说"在文气、风格、创作主体、心理结构等方面发表了自己的见解.他的"文以气为主"的命题,开辟了从作家精神世界角度把握作品基本特色的思路,并初步接触了作家与风格的关系,确立了我国古代风格论以创作主体为中心的基调.     

Developmental changes in ideas about lying

Videotaped stories depicting deliberate lies and unintentionally untrue statements were presented to 200 subjects evenly divided into the following age groups: 5, 8, 9, and 11 years and adult. Definitions of lying were seen to change gradually over this age range. Adults were more lenient than children in their moral evaluations of all the statements. All age groups rated a guess that did no harm as better than one that caused trouble, and they all judged selfishly motivated lies to be worse than both unintended falsehoods and "jocose" lies that aimed to please the listener. 11-year-olds tended to justify the prohibition against lying in terms of trust and fairness, whereas younger children cited authority's punitive sanctions.     

论职业教育中的几个认识误区

对职业教育某些方面的误读是造成当今职业教育萎缩的原因之一，如对职业教育本质的理解，对职业教育作用范围，市场经济在职业教育中的作用、兼职教师的重要性以及大职教观与新职教观的关系等的认识，只有对这些方面有一个明确、清晰的认识，才能使职业教育快速发展。     

Student ideas about weathering and erosion

Abstract

This paper provides an overview and discussion of a study concerning student ideas about the terms ‘weathering’ and ‘erosion’. It describes the results of a survey conducted on 236 students, aged 16‐19, to ascertain details of their ideas about these two terms. The main factor students use to discriminate between weathering and erosion is movement. A majority of students appreciate that weathering occurs in situ, whereas erosion involves transport. Many students regard weathering as solely related to atmospheric elements, which results in some erosional and weathering processes being incorrectly classified. Human actions are perceived as types of accelerated erosion, but uncertainty surrounds whether animal activities are bio‐erosion or biological weathering. This uncertainty is also reflected in the literature. Taken collectively the results have a number of implications for teachers addressing these concepts and for the students they teach.     

Children's Ideas about Strengthening Structures

This research focused on 181 school children's (aged 5-13 years) responses to an Awareness of Technology Survey question intended to explore their conceptual knowledge of structural strength. The survey responses showed that the children had many productive ideas about structural strength prior to formal classroom instruction. After instruction, the children's ideas showed little overall change. The Discussion explores how the framework of the programme and professional development opportunities did not help the teachers to implement the programme. Suggestions for productive classroom experiences related to structural strength include: introducing children to a greater variety of building materials; assisting children to explore the physical and mechanical properties of materials; practising with vocabulary needed to describe properties of materials; providing opportunities to understand the pushes and pulls at work in a structure; and promoting design technology discourse.     

Children's Gender-Based Reasoning about Toys

The goal of these studies was to investigate how preschool children use gender-based reasoning in making judgments about toy preferences for themselves and for others. In Studies 1 and 2, children ( n = 22, n = 71) were shown unfamiliar, non-sex-typed toys and asked to rate how much they, other girls, and other boys would like each toy. As expected, children made gender-based inferences: "What I like, children of my sex will also like, and children of the other sex will not like." Study 3 was designed to assess how children use gender-based reasoning to make decisions about attractive and unattractive toys when they are given gender labels. Children ( n = 91) were shown unfamiliar toys varying in attractiveness that were given explicit gender labels (e.g., "this is a toy girls really like") or no label. With a different experimenter (to avoid demand characteristics), children rated their own and others' liking of the toys. Children used gender labels to guide their own preferences and their expectations for others. Even with very attractive toys, children liked toys less if they were labeled as being for the other sex, and expected other girls and boys to do the same. The role of gender-based reasoning in cognitive theories of gender and on children's play preferences is discussed.     

Children's Beliefs about Long-Term Retention

In 2 experiments, we examined pre-school, grade 1, and grade 3 children's metamemory about long-term retention. Specifically, we examined beliefs about the type of information most likely to be forgotten and beliefs about the impact of suggestions and retroactive interference on memory. Children made and explained paired-comparison judgments concerning the differential forgetting of peripheral versus central information, whether misinformation effects would arise from suggestions by others, and whether retroactive interference would arise from experiencing two similar events. The major findings were that ( a ) most children believed that events central to a story would be retained better than peripheral details; ( b ) in preschool and first grade, children believed that memory was invulnerable to suggestion (from a parent or a sibling), but in third grade, children believed suggestion could adversely affect memory; ( c ) most preschoolers believed that retroactive interference effects would not occur, whereas most first and third graders acknowledged that they would; ( d ) older children believed that both suggestibility and interference were less likely given a retention interval of several months compared to 1 day; and ( e ) in explaining their beliefs, children assigned sensory-behavioral factors a major causal role in determining what would be remembered over the long term. These results are discussed in terms of the development of beliefs about memory and the mind in general.