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Analyses of classroom interaction have frequently spotlighted reasoned dialogue as beneficial for student learning, and research into small-group activity amongst students offers empirical support. However, the evidence relating to teacher-student interaction has never been compelling, and one of the few studies to investigate the issue directly detected no relation whatsoever between reasoned dialogue and learning outcomes. The present paper outlines additional data from that study, together with evidence from elsewhere, with a view to interpreting the results relating to reasoned dialogue. Account is taken of the generally positive evidence obtained from studies of group work amongst students. The key proposal is that it may be reasoned opposition that promotes learning rather than reasoned dialogue in general, and reasoned opposition is probably rare when teachers are involved. The proposal has implications for both the dialogic and the argumentation perspective upon classroom interaction, and these are discussed.

Scholarly interest in dialogic pedagogy and classroom dialogue is multi-disciplinary and draws on a variety of theoretical frameworks. On the positive side, this has produced a rich and varied body of research and evidence. However, in spite of a common interest in educational dialogue and learning through dialogue, cross-disciplinary engagement with each other's work is rare. Scholarly discussions and publications tend to be clustered in separate communities, each characterized by a particular type of research questions, aspects of dialogue they focus on, type of evidence they bring to bear, and ways in which standards for rigor are constructed. In the present contribution, we asked four leading scholars from different research traditions to react to four provocative statements that were deliberately designed to reveal areas of consensus and disagreement. Topic-wise, the provocations related to theoretical foundations, methodological assumptions, the role of teachers, and issues of inclusion and social class, respectively. We hope that these contributions will stimulate cross- and trans-disciplinary discussions about dialogic pedagogy research and theory.

As part of an investigation into the relationship between classroom dialogue and student outcome, a test of reasoning has been developed that is suitable for preadolescents (i.e. c.10-13-year-olds). Building on previous work but expanding this considerably, the test focuses upon four areas of reasoning: differentiation of facts from opinions, differentiation of reasons from conclusions, inference of implications, and evaluation of multiple reasons. This paper reports on the test's design and development (including the repeated cycles of piloting and redrafting), highlighting the methodological challenges that were faced (e.g. from linguistic demands), and how these were addressed. It also outlines how the test was trialled in English schools, including its use in a paper-based version with 218 students, and in a digital version with 129 students. Patterns of student performance were comparable across the two samples and also provide evidence for acceptable test reliability and validity. Thus, in addition to spotlighting methodological issues of general relevance within educational research, the paper presents a test that successfully assesses key aspects of student reasoning. The test is the first of its kind to be designed for this age group, and is offered as freely available for future research.

There is compelling evidence that arguing with peers in educational contexts fosters students' content knowledge and argumentation skills. Indeed, curricula have already been developed that, through tailored support for peer argumentation, promote both content knowledge and argumentation skills simultaneously. However, we do not yet know how to optimize the occurrence of peer argumentation, although there are suggestions in the literature that computers may have a role to play. Likewise, there are uncertainties about the mechanisms through which the benefits of peer argumentation are achieved, especially whether (and how) there is interdependence across the two types of benefit. In this paper, we report a quasi-experimental study randomized at class level, which addresses these two issues. A total of 502 fourth-grade students and 20 classes and teachers covered a module in science under three conditions: (1) using a curriculum that was already known to promote peer argumentation and content knowledge (standard support), (2) using the same curriculum but with additional computer-based support (computer-enhanced support), and (3) a routinely taught control group. Students' argumentation skills and content knowledge were assessed. Content knowledge was assessed prior to and after the intervention, with immediate and delayed posttests. Multiple regression analyses showed that peer argumentation was indeed most frequent in the computer-enhanced condition. Moreover, on the basis of a multilevel path analysis, we found that individual contributions to peer argumentation had a direct effect on posttest argumentation skills and an indirect effect on posttest content knowledge, both immediate and delayed. The indirect effect of argumentation on delayed posttest content knowledge was mediated by immediate posttest knowledge and posttest argumentation skills.

Research into classroom dialogue suggests that certain forms are especially productive for students' learning. Despite the large number of studies in this area, there is inadequate evidence about the prevalence of the identified forms, let alone their productivity. However, scarcity is widely presumed. The overall aim of the study reported in this article was to examine the extent to which the forms are embedded within current practice in English primary schools. Video-recordings of two lessons from each of 36 classrooms formed the database, with two subjects from mathematics, English and science covered in each classroom. Each lesson was coded per turn for the presence of 'dialogic moves' and rated overall for the level of student involvement in specified activities. Results revealed that the supposedly productive forms were not always as scarce as sometimes presumed, while also highlighting huge variation in their relative occurrence. They also point to the role of professional development (PD) for teachers in promoting use of some forms.

Postgraduate students involved in delivering undergraduate teaching while working toward a research degree are known as graduate teaching assistants (GTAs). This study focused upon the problems and benefits arising from this dual role as researchers and teachers, as perceived by GTAs at the University of Cambridge. To this end, GTAs at Cambridge were invited to participate in an online survey (n = 153). Teaching is seen to offer a wide range of benefits to GTAs, including benefits to the GTAs' own research, transferable skills development, career development and teaching skills. Time pressures emerged as the principal problem associated with the role. The data are consistent with findings from previous studies, while also providing further detail about the nature of the benefits and problems. In particular, additional insights are offered relating to benefits and problems associated with different teaching activities, and disciplinary differences.

Background: Dialogic teaching, specifically the use of argumentation in teaching, is seen as promoting scientific literacy and understanding. However, international evidence consistently shows that the prevailing modes of classroom talk are monologic. The problem is how to transform science education into dialogic and argumentative spaces. One way to do this is through the use of curriculum materials that support and scaffold dialogic practices. Although there is growing interest in promoting argumentation through curriculum materials, their effect on students' learning and the relationship between curriculum-supported argumentation and learning are still not clear. Purpose: The aim of this study was to contribute to this knowledge gap. We replicated research conducted in the UK as part of the epiSTEMe project, in which curriculum materials supporting dialogic classroom talk were developed and evaluated through a randomised experimental study. Sample: A total of 220 students (aged 10-11 years) from 18 classrooms participated in the study, with the classrooms spread across 18 public schools all located in Santiago, Chile. Design and method: We conducted an experimental study randomised at school level. Eleven teachers delivered science lessons following a teaching programme especially developed to foster dialogic and argumentative classroom talk (the intervention group), and seven teachers delivered lessons in their usual way (the control group). Students were assessed individually using pre- and post-measures of science content knowledge and argumentative skills. Results: The results showed that the intervention group obtained significantly higher pre- to post-gains on science content knowledge. Although the control group engaged in significantly more whole-class argumentative dialogue than the intervention group, this did not predict content knowledge learning in the control group. By contrast, in the intervention group the frequency of whole-class argumentative dialogue had a strong and positive effect on the delayed content knowledge post-test, controlling for initial measures.

This commentary discusses the four papers that comprise the special issue on dialogic teaching and learning, while making general observations that apply across the field as a whole. Similarities and differences are identified over the concepts of "dialogue" and "dialogic pedagogy". The possibility is raised that some aspects of dialogic pedagogy are more tractable than others, perhaps because they are more readily mapped onto traditional practices. The implications of this for analysing the dialogue-learning relation are considered. Attention is paid to the relevance for classroom dialogue of topic, epistemology, multilingualism, and the wider socio-political context. Finally, the challenge of scalability is addressed, in particular the need for cost-effective methods of teacher professional development if dialogic pedagogy is ever to become widely embedded in classrooms. [For the papers discussed in this commentary, see "Democracy, Voice and Dialogic Pedagogy: The Struggle to Be Heard and Heeded" (EJ1130971); "Trans/Languaging and the Triadic Dialogue in Content and Language Integrated Learning (CLIL) Classrooms" (EJ1130972); "Instructional Coaching through Dialogic Interaction: Helping a Teacher to Become Agentive in Her Practice" (EJ1130974); and "Toward a More Dialogic Pedagogy: Changing Teachers' Beliefs and Practices through Professional Development in Language Arts Classrooms" (EJ1130975).]

Background: Even infants can recognize whether patterns of motion are or are not natural, yet an acknowledged challenge for science education is to promote adequate reasoning about such patterns. Since research indicates linkage between the conceptual bases of recognition and reasoning, it seems possible that recognition can be engaged to support reasoning. Purpose: Noting the theoretical and practical significance of showing that recognition can support reasoning, the reported research aimed to examine the possibility in relation to horizontal motion. Sample: The research was conducted with 167 children (mean age = 9.51 years) from Years 4, 5 and 6 of an English-medium school located in Lisbon, Portugal. Design and methods: Individual pre-tests were administered to all participants to assess initial reasoning about the direction and speed with which rolling balls travel after collision. Reasoning was assessed in the sense of both predicting and explaining. Thereafter, about two-thirds of the sample worked with software that, via simulations of the incorrect patterns that were typically predicted (and comparison with simulations of correct patterns), engaged recognition as feedback on reasoning. The remaining children became an untutored control group. Replicating characteristic computer use in classrooms, half of the software sample worked as singletons with adult guidance available on request and half worked in pairs without the option of guidance. A few weeks later, all participants were post-tested following pre-test procedures. Results: Pre- to post-test change amongst the children who worked with the software exceeded pre- to post-test change within the control group, and this was observed with both predictions and explanations. The differences were strongest amongst the children who worked as singletons, even though they seldom requested adult support. Conclusions: Although issues remain to be addressed before the approach can be optimized, its viability as support for reasoning has been demonstrated, and this may have relevance beyond horizontal motion.

In response to continuing concerns about student attainment and participation in science and mathematics, the "epiSTEMe" project took a novel approach to pedagogy in these two disciplines. Using principles identified as effective in the research literature (and combining these in a fashion not previously attempted), the project developed topic modules for early secondary-school teaching in the UK, arranged for their implementation in classrooms, and evaluated the results. This paper reports the development, implementation, and evaluation of one of the "epiSTEMe" science modules. Entitled "Forces and Proportional Relations", the module covers standard curricular material in the domain of forces, while paying particular attention to the proportional nature of many key constructs. It was developed in collaboration with a small group of teachers; implemented subsequently in 16 classrooms, in all cases involving students from the first year of secondary school; and evaluated through comparison with first-year students in 13 control classrooms who were studying the topic using established methods. Evaluation addressed topic mastery and opinions about the topic and the manner in which it was taught. While further research is required before definite conclusions are warranted, results relating to topic mastery provide grounds for optimism about the "epiSTEMe" approach. Furthermore, student opinions about the module were positive.

Reflecting concerns about student attainment and participation in mathematics and science, the Effecting Principled Improvement in STEM Education ("epiSTEMe") project attempted to support pedagogical advancement in these two disciplines. Using principles identified as effective in the research literature (and combining these in a novel fashion), the project developed topic modules for early secondary-school teaching in the UK, arranged for their implementation in classrooms, and evaluated the results. This article reports the development, implementation and evaluation of the "epiSTEMe" mathematics module entitled "Fractions, Ratios and Proportions." The module covers aspects of rational number and proportional reasoning relevant to the early secondary curriculum, and was developed in collaboration with teachers, implemented in 11 classrooms, and evaluated through comparison with 16 control classrooms where the topic was addressed using established methods. Students who used the "epiSTEMe" materials made significantly greater progress than control students as regards topic mastery, while holding positive opinions about their teaching and learning experiences.

Since the late 1990s, there has been consensus among educational researchers that argumentation should play a central role in science education. Although there has been extensive relevant research, it is not clear enough how oral argumentation spontaneously occurs in science teaching. This is particularly important with regard to the empirical evidence suggesting the effect of discussion of contradictory views on scientific learning. In order to contribute to the research on argumentation in science teaching, we conducted a study that aims to sketch a panoramic view of the uses of oral argumentation in Chilean middle-school science teaching. A total of 153 videotaped science lessons were observed, involving students aged 10-11 and 12-13. Whole-class argumentative discourse was analysed as a function of thematic episodes and teachers' and students' utterances. Results suggest that argumentative discourse in which contradictory points of view are discussed is scarce but when it occurs it does so predominantly within discourse among students. On the contrary, argumentation aimed at justifying points of view is widely used, even more so when students are older.

This article reports the findings of a one-year longitudinal study that investigated the impact of group work on the development of students' critical thinking in Hong Kong secondary schools. It explores whether the participation of teachers in a group-based teaching intervention adapted from an earlier study conducted in the United Kingdom (UK) facilitated students' use of critical arguments in Liberal Studies lessons. In addition to examining students' critical thinking skills through test performance and the use of reasoned justifications in written class-work, the article also discusses the applicability to the Hong Kong context of the programme on which the intervention was based. In general, the results of the study indicate that group work is more effective than whole-class instruction in developing students' critical-thinking skills and that students make better progress in "teacher-supported" than 'student self-directed' group work.

Previous research indicates children reason in different ways about horizontal motion and motion in fall. At the same time, their understanding of motion down inclines appears to result from an interaction between horizontal and vertical motion understanding. However, this interaction is still poorly understood. Understanding of speed change may shed further light due to its critical role in natural object motion. This is addressed by the present two studies. Children (n = 144) aged 5-11 years predicted whether a ball, either heavy or light, would accelerate, decelerate or move at unchanging speed along a horizontal, in fall and down an incline, both in a real-object task (Study 1) and a computer-presented task (Study 2). The results suggest understanding of speed change is typically limited to the expectation that change takes place between a point of no motion and any subsequent point in motion, but not between two subsequent points. Despite improvements with age, predictions of continued speed change barely exceeded chance levels in the oldest age group. Modest effects of object mass were noted. Response time data provide further insight regarding children's predictions, highlighting similarities and differences in reasoning between motion dimensions. The overall findings are used to develop clearer ideas about the development of children's understanding of speed change as well as to advance commonsense theories of motion.

When students reason during school science, they often refer to conceptions that are derived from out-of-school experiences and are poor proxies for science orthodoxy. However, for some areas of science, these conceptions represent only a proportion of students' full conceptual knowledge, for tacit understanding exists that is superior to the understanding displayed when reasoning. Noting that tacit understanding is engaged when events are judged as natural or non-natural, the paper is concerned with software that: (a) requires direction and speed of falling objects to be predicted, i.e. a typical science reasoning task that engages conceptual knowledge; (b) presents simulations of predicted motion in the expectation that its naturalness or non-naturalness would be recognised. An evaluation study is reported where children aged 8-12 years worked with the software in contexts that typify computer use in classrooms, i.e. individually under adult guidance ("n" ?=? 44 children) or in pairs with a classmate (n ?=? 48 children). They were observed while they did this. Reasoning about object fall was assessed via change from individual pre-tests administered prior to software usage to individual post-tests administered a few weeks afterwards. The children who worked with the software showed greater pre- to post-test gains in conceptual understanding than control children ("n" ?=? 47 children), who lacked software experience. The gains were especially marked for the children who worked in pairs. The approach taken is contrasted with traditional approaches to conceptual change in school science, e.g. strategies that rely upon classroom experiments. (Contains 1 note, 1 figure, and 2 tables.)

This article reports research that is contextualised within reforms of secondary education in Hong Kong and the reintroduction of Liberal Studies, which jointly emphasise the need for a learning environment that facilitates the practice of group work and the development of critical thinking. A study is described that explores the relevance of group work for fostering critical thinking, looking in particular at the participation of teachers in small group activity. While attention is paid to the results of critical thinking tests and excerpts extracted from the students' dialogues, the research also seeks to highlight the role of the teacher in breaking stalemates in discussion with appropriate interventions. In sum, this article concludes by illustrating the importance of collaborative group work in the development of students' critical thinking skills. (Contains 3 figures and 3 tables.)

Adults make erroneous predictions about object fall despite recognizing when observed displays are correct or incorrect. Prediction requires explicit engagement with conceptual knowledge, whereas recognition can be achieved through tacit processing. Therefore, it has been suggested that the greater challenge imposed by explicit engagement leads to elements of conceptual understanding being omitted from prediction that are included in recognition. Acknowledging that research with children provides a significant context for exploring this "omission hypothesis" further, this article reports two studies with 6- to 10-year-olds, each of which used prediction and recognition tasks. Study 1 (N = 137) focused on understanding of direction of fall, and Study 2 (N = 133) addressed speed. Although performance on the recognition tasks was generally superior to performance on the prediction tasks, qualitative differences also emerged. These differences argue against interpreting explicit level understanding purely in terms of omission of tacit constructs, and the article outlines alternative models that may account for the data. (Contains 2 figures and 4 tables.)

Studies of primary education within the UK have shown that small groups can feature within classrooms; however, equivalent research within secondary education remains scarce. Research has established effective group work approaches, yet secondary teachers may encounter difficulties employing approaches tied to parameters embedded within primary education. This problem is compounded as minor adjustments to the conditions surrounding group work are known to have consequences for its efficacy within classrooms. This paper reports naturalistic systematic observation of group work practice within 23 science and English secondary classrooms in Scotland. Pupils completed tasks according to whether they were situated within group work or conventional classes. Forms of dialogue known to be conducive to learning were prevalent whilst pupils worked in groups. The change in pupils' behaviours does not appear to stem from the content of teachers' talk. Teachers' behaviour suggested they approach small groups as smaller structures equivalent to a whole-class set-up. (Contains 1 figure, 4 tables and 4 notes.)

Background: Children are not blank slates when they begin school; they bring prior conceptions about the everyday world with them. These conceptions usually do not comply with accepted scientific views and have to be changed within the process of education. However, to do this effectively more needs to be known about the relationship between the everyday world and children's knowledge of scientific principles. Purpose: This study sought answers to the question of which object variables children use when reasoning, and how these variables are associated with outcomes. The reported study addresses these issues in relation to object motion. Sample, design and methods: UK primary school children (n = 144) aged 5-11 years were assessed on their predictions of motion along a horizontal, in fall and down an incline using a range of everyday objects by responding to questions where they needed to compare potential motion patterns of the objects. Results: Round shape and smooth texture of objects were consistently associated with faster motion across age groups as well as across motion dimensions. However, faster horizontal motion was associated with lighter and smaller objects across all ages, whereas faster fall was associated with heavier objects. While younger children predicted faster incline motion for lighter and smaller objects, there was a shift in conceptions with age, with older children predicting faster motion for heavier and bigger objects. Conclusions: The overall findings are used to support the development of commonsense theories of motion previously identified, and suggestions for educational practice are made. Specifically, it is suggested that these findings may need to be taken into consideration in the development of teacher training programmes. (Contains 3 figures.)

Student mastery of rational number and proportional reasoning is a recognized challenge, yet supporting mastery is central within mathematics and science. This paper focuses on a 4-lesson teaching programme which was designed to foster mastery in the context of intensive quantities. Intensive quantities such as density, speed and temperature depend upon proportional relations, require rational number for their representation and are relevant to science. Two versions of the teaching programme were developed, one using ratio representation and the other using fractions. Implementation with 535 children aged 9-11 years revealed that both versions promoted mastery of fractions, whilst the ratio version also supported proportional reasoning. It is suggested that the ratio version provides useful foundations for teaching, even with children who, as with the present sample, have no previous experience of ratios themselves.

A distinction can be drawn between extensive and intensive quantities. Extensive quantities (e.g., volume, distance), which have been the focus of developmental research, depend upon additive combination. Intensive quantities (e.g., density, speed), which have been relatively neglected, derive from proportional relations between variables. Thus, while proportional relations can be expressed with extensive quantities, these relations are "constitutive" with intensive quantities. One consequence is that factors, which are theorized as marginal with extensive quantities, are conceptually central in intensive contexts, and may need to be recognized in developmental models. Two such factors, termed "variable salience" and "relational focus", are examined here, via a study where 963 Scottish children aged 7-12 years were asked to solve 42 intensive quantity problems in comparison and missing value format. Reasoning improved with age, but at all ages it was strongly influenced by variable salience and relational focus. Moreover, the manner in which these two factors interacted with other factors differed from what might be expected from models of proportional reasoning with extensive quantities. Based upon these results, it is argued that the distinction between extensive and intensive quantities is theoretically significant, and intensive quantities need to be granted more attention in the future.

A large body of research has demonstrated the value of fostering peer interaction in the context of collaborative group work as an effective strategy to facilitate learning. The present study attempted to enable teachers in a varied sample of 24 Scottish primary classrooms to improve the quality of collaborative group work interaction among their pupils. Observations were carried out at three time points during the year of the intervention, both during whole class teaching and planned group work activity. A global rating instrument was also used to evaluate the overall quality of classroom environment created by participating class teachers to support group work sessions. The results showed significant increases both in the observed frequencies of children's collaborative dialogue and in the rated quality of classroom learning environments over the course of the study. The implications of these results are discussed in the context of current curricular reform. (Contains 4 tables.)

Evidence exists that children's understanding can be facilitated through collaborative group work with peers, but little is known about the underlying processes. When processes are discussed, they are typically assumed to involve the assimilation of superior ideas that are constructed jointly. However, the assimilation of joint constructions cannot provide a complete account, and recent work suggests that unresolved contradiction during group interaction may contribute. Research is reported that examines the balance between unresolved contradiction and joint construction, via analyses of collaborative group work where 8- to 12-year-old children explored motion down an incline, rates of cooling, and floating in water. Results are consistent with processes stimulated by unresolved contradiction, but not with the assimilation of joint constructions.

Group work has been promoted in many countries as a key component of elementary science. However, little guidance is given as to how group work should be organized, and because previous research has seldom been conducted in authentic classrooms, its message is merely indicative. A study is reported, which attempts to address these limitations. Twenty-four classes of 10-12-year-old pupils engaged in programs of teaching on evaporation and condensation, and force and motion. Both programs were delivered by classroom teachers, and made extensive use of group work. Pupil understanding progressed from pre-tests prior to the programs to post-tests afterwards, and results suggest that group work played a critical role. Organizational principles are extrapolated from the findings, which could be readily adopted in classrooms.

Occasions where children oppose each other have been claimed to convey intellectual benefits through their association with justification and resolution. They have been claimed to promote social rejection through their association with aggression. Because it is inconceivable that intellectual benefits imply social costs, either the relation amongst opposition, justification, resolution, and aggression is weaker than claimed, or children differ in their use of justification, resolution, and aggression during opposition. To explore these possibilities, 49 triads, comprising children aged 4 to 7 years, were videotaped while they engaged in free play and structured activities. The children varied in gender and temperament, and the triads varied in gender composition. Justification, resolution, and aggression were all relatively frequent in oppositional contexts. However, the use of justification and resolution during opposition was clearly separated from the use of aggression. Gender, temperament, age, and gender composition of triad were all relevant to the oppositional behaviour that children displayed.