Using Computer Simulations for Promoting Model-based Reasoning

Scientific reasoning is particularly pertinent to science education since it is closely related to the content and methodologies of science and contributes to scientific literacy. Much of the research in science education investigates the appropriate framework and teaching methods and tools needed to promote students’ ability to reason and evaluate in a scientific way. This paper aims (a) to contribute to an extended understanding of the nature and pedagogical importance of model-based reasoning and (b) to exemplify how using computer simulations can support students’ model-based reasoning. We provide first a background for both scientific reasoning and computer simulations, based on the relevant philosophical views and the related educational discussion. This background suggests that the model-based framework provides an epistemologically valid and pedagogically appropriate basis for teaching scientific reasoning and for helping students develop sounder reasoning and decision-taking abilities and explains how using computer simulations can foster these abilities. We then provide some examples illustrating the use of computer simulations to support model-based reasoning and evaluation activities in the classroom. The examples reflect the procedure and criteria for evaluating models in science and demonstrate the educational advantages of their application in classroom reasoning activities.     

Distance Learning for Teacher Professional Development in Statistics Education

We provide an overview of EarlyStatistics, an online professional development course in statistics education targeting European elementary and middle school teachers. The course facilitates intercultural collaboration of teachers using contemporary technological and educational tools. An online information base offers access to all of the course content and resources.     

What a difference a day makes: Estimating daily learning gains during kindergarten and first grade using a natural experiment

Knowing whether time spent in formal schooling increases student achievement, and by how much, is important for policymakers interested in determining efficient use of resources. Using the ECLS-K, we exploit quasi-randomness in the timing of assessment dates to examine this question. Conservative estimates suggest a year of school results in gains of about one standard deviation above normal developmental gains in both reading and math test scores. The results are statistically significant and extremely robust to specification choice, supporting quasi-randomness of test dates. Estimates of skill accumulation due to formal schooling do not vary based on socioeconomic characteristics.     

An analytical framework for the cross-country comparison of higher education governance

In this article we provide an integrated framework for the analysis of higher education governance which allows us to more systematically trace the changes that European higher education systems are currently undergoing. We argue that, despite highly insightful previous analyses, there is a need for more specific empirically observable indicators of policy change and inertia. We therefore propose a systematic classification of empirical indicators of higher education governance. To do so, we look at three historically entrenched and still highly relevant European models of higher education??academic self-governance, the state-centered model and the market-oriented model. Based on these broader overarching models which reflect the tensions between the state, market and academia, we develop three ideal-types that take internal university governance as well as the role of the state and external stakeholders into account. Against this background, we derive empirical indicators with regard to the institutional balance of power, financial governance, personnel autonomy and substantive matters. Our analytical contribution shall enable scholars, and in particular political and social scientists, to trace ongoing patterns of change and convergence as well as persistence and inertia in higher education governance arrangements.     

On-line learning networks: Framework and scenarios

The idea of using the internet as a platform to mediate social interactions and learning at different levels has progressively affirming itself, and this has given rise to a huge number of spontaneous and planned collectives, which are often described as on-line learning networks. On-line learning networks create value through the combination of content and people’s knowledge. They can vary widely in the strength and permanence of their connections and the resources necessary to maintain them. Aspects of both a pragmatic and social nature need to be carefully considered in the process of initiation of on-line learning communities. This paper considers learning networks from the perspective of the potential they offer to the strengthening of relationships among institutions, groups, and people sharing a common interest in computer-enhanced learning. Some case studies are analysed and an analytical framework is sketched out to guide observations and to provide a lens through which case studies can be interpreted. The final goal is to delineate a reference for identifying strong and weak elements in virtual networks and to examine under what conditions they are succeeding. In addition, some possible scenarios for on-line networks are delineated along two main lines: the organisation and structure of the network and its level of establishment.

Comparison Between Colorimetry and Sensory Panel in Studying Similarity Between Roman and Integration Bricks,Assisted by Multivariate Data Treatment

ABSTRACT

The restoration of the Roman building of the third-fourth century CE called Minerva Medica, in Rome, highlighted a problem concerning the choice of the color of the bricks for integration. Current conservation practice in Italy favours a restoration that as much as possible is consistent with the original but leaves some visible differences to a careful observer. Color measurement is usually performed using portable spectrocolorimeters that provide the reflectance spectrum and also colorimetric parameters such as L* a* b*, h* L* C*, RGB, etc. In other sectors, such as for olive oils, for wines, and also for the colors of commercial products, sensory panels are used to provide results of difference/similarity and are known to be similar to observations made by consumers. In this study, data from a top quality spectrocolorimeter and from a sensory panel are compared. Twenty non-professional people were involved in the comparison between seven restoration bricks and three ancient Roman bricks from the studied site. Observations took place in a room with controlled lighting, and each observer filled out a sensory card using about 2000 known comparison colors. Comparison of the results was carried out with graphic methods and by means of cluster analysis. The results show that the sensory panel could be a useful alternative to colorimetry, while cluster analysis allowed a significant response to questions posed by conservation professionals, and was confirmed by other graphic-statistical methods.