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See detailEntdeckendes Lernen im Mathematikunterricht der Grundschule: Geometrie
Kreis, Yves UL

Book published by University of Luxembourg - 2. Aufl. (2011)

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See detaili2g Common File Format Final Version
Egido, Santiago; Hendriks, Maxim; Kreis, Yves UL et al

Report (2010)

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See detailGeoGebra - Dynamic Mathematics for Everyone
Kreis, Yves UL

Scientific Conference (2010, July 27)

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See detailTechnical Aspects of Intergeo
Kreis, Yves UL; Kortenkamp, Ulrich

Scientific Conference (2010, July 02)

• Formal Descriptions of Constructions, Exercises and other Digital Content in Mathematics • Data Exchange in Mathematics and Mathematics Education • Comparison of Interactive Geometry Tools • Mathematics ... [more ▼]

• Formal Descriptions of Constructions, Exercises and other Digital Content in Mathematics • Data Exchange in Mathematics and Mathematics Education • Comparison of Interactive Geometry Tools • Mathematics Education and Social Networks/Web 2.0 • Integration of Digital Content in the Classroom • Innovative Uses of ICT in Teaching Mathematics [less ▲]

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See detailGeoGebraPrim - GeoGebra for Primary School
Kreis, Yves UL; Dording, Carole; Keller, Ulrich UL

Scientific Conference (2010, June 30)

The aims of the project are on one hand the improvement of the children’s understanding of the elementary geometric concepts and on the other side a deeper insight in the bond of geometry and algebra. The ... [more ▼]

The aims of the project are on one hand the improvement of the children’s understanding of the elementary geometric concepts and on the other side a deeper insight in the bond of geometry and algebra. The study consists in a pre-/post-test scenario combined with observations of particularly interesting situations. All in all 59 children of 9 years have participated; about half of them have followed a traditional paper/pencil geometry course while the others have been mixing experiences on the computer to the traditional ones. In last years presentation we have given a short overview of the project, explained the educational and technological concepts used and presented first results of the study. This year we will present the outcomes of the project based on statistical analysis of the children's answers comparing the different questions/tests as well as our observations during class. [less ▲]

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See detailThe Future of GeoGebra
Kreis, Yves UL; Hohenwarter, Markus

Scientific Conference (2010, June 29)

The development team of GeoGebra is growing and very busy. Besides GeoGebra was selected to participate in the Google Summer of Code (GSoC) initiative where 5 students have been assigned to the ... [more ▼]

The development team of GeoGebra is growing and very busy. Besides GeoGebra was selected to participate in the Google Summer of Code (GSoC) initiative where 5 students have been assigned to the association. In our presentation we will show alpha and beta development ideas which might get included in a future GeoGebra version: GeoGebraCAS, GeoGebra3D, GeoGebraTouch, Layout Manager, Locus Line Equation, Implicit Plotting, ... [less ▲]

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See detailFirst International GeoGebra Conference 2009
Chrysanthou, Irene; Hohenwarter, Judith; Hohenwarter, Markus et al

Report (2010)

The principal aim of the First International GeoGebra Conference 2009 was to discuss the direction and vision the GeoGebra community should take in the future. On July 14th and 15th, 2009, a group of 114 ... [more ▼]

The principal aim of the First International GeoGebra Conference 2009 was to discuss the direction and vision the GeoGebra community should take in the future. On July 14th and 15th, 2009, a group of 114 people from 35 countries met for the First International GeoGebra Conference in Hagenberg, Austria at the RISC institute of the Johannes Kepler University Linz. During these two days researchers, developers, and teachers discussed and shared their experiences and ideas concerning GeoGebra in five working groups: Software Development and Online Systems; Teaching Experiences in Primary and Secondary Schools; Creation of Instructional Materials; GeoGebra at Universities and in Teacher Education; GeoGebra Institutes and Research. This report summarizes the GeoGebra related experiences of the conference participants as well as outcomes of the working group discussions and future plans for the development of GeoGebra and its user community. [less ▲]

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See detailKonstruktionsbeschreibungen und DGS
Kortenkamp, Ulrich; Kreis, Yves UL

in Lindmeier, Anke M.; Ufer, Stefan (Eds.) Beiträge zum Mathematikunterricht 2010 (2010)

Die Fähigkeit zur Formalisierung von Konstruktionsbeschreibungen ist ein Ziel im Mathematikunter-richt. Oft mangelt es Schülerinnen und Schülern an der notwendigen Strenge. Dabei ist unklar, wie genau ... [more ▼]

Die Fähigkeit zur Formalisierung von Konstruktionsbeschreibungen ist ein Ziel im Mathematikunter-richt. Oft mangelt es Schülerinnen und Schülern an der notwendigen Strenge. Dabei ist unklar, wie genau eigentlich eine solche Beschreibung sein muss. Aus der Entwicklung eines gemeinsamen Dateiformates für DGS heraus stammt eine Betrachtungs-weise, die die mathematische Beschreibung von Konstruktionen vereinfacht. Eine klare Trennung von Objekten und ihren Beziehungen zueinander hilft nicht nur dem Computer, sondern sowohl Lehrper-sonen als auch Lernenden, den Kerngedanken einer Konstruktion zu verstehen. Dies hat nicht nur Einfluss auf die Verschriftlichung von Konstruktionen, sondern auch auf den Umgang mit DGS all-gemein (Konstruktionsreihenfolge, Umkehrung von Konstruktionen, freie/abhängige Elemente). Wir stellen zudem vor, wie das neue i2g-Format, welches im Intergeo-Projekt (http://i2geo.net) entwi-ckelt wurde, den Datenaustausch zwischen verschiedenen Geometrie-Programmen ermöglicht (hier: GeoGebra und Cinderella). [less ▲]

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See detailGeoGebraPrim - GeoGebra in der Grundschule
Kreis, Yves UL; Dording, Carole UL; Keller, Ulrich UL

in Lindmeier, Anke M.; Ufer, Stefan (Eds.) Beiträge zum Mathematikunterricht 2010 (2010)

In diesem Artikel wird das von der Universität Luxemburg finanzierte For-schungsprojekt GeoGebraPrim – GeoGebra in der Grundschule vorgestellt. Wir geben zuerst einen kurzen Überblick über das ... [more ▼]

In diesem Artikel wird das von der Universität Luxemburg finanzierte For-schungsprojekt GeoGebraPrim – GeoGebra in der Grundschule vorgestellt. Wir geben zuerst einen kurzen Überblick über das Forschungsprojekt, er-klären anschließend die angewandten pädagogischen und technologischen Konzepte und stellen schlussendlich einige Resultate vor. [less ▲]

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See detailDynamic mathematics and computer-assisted testing: GeoGebra inside TAO
Kreis, Yves UL; Dording, Carole; Porro, Vincent et al

in Kortenkamp, Ulrich; Pech, Pavel; Dohrmann, Christian (Eds.) et al Proceedings of the Interoperable Interactive Geometry Conference 2010 (2010)

In this article we present the integration of the dynamic mathematics system GeoGebra into the computer-assisted testing framework TAO. One chapter is dedicated to the explanations of the tools involved ... [more ▼]

In this article we present the integration of the dynamic mathematics system GeoGebra into the computer-assisted testing framework TAO. One chapter is dedicated to the explanations of the tools involved as well as their communication. Another one focuses on a small-scale test, explaining the building of such a test, describing its realization as well as the constraints met and reporting on the collected data as well as its possible usage. [less ▲]

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See detailInteroperable Interactive Geometry for Europe - First Technological and Educational results and future challenges of the Intergeo project
Kortenkamp, Ulrich; Blessing, Axel M.; Dohrmann, Christian et al

in Durand-Guerrier, Viviane; Soury-Lavergne, Sophie; Arzarello, Ferdinando (Eds.) Proceedings of the Sixth Congress of the European Society for Research in Mathematics Education (2010)

In this overview article we describe the manifold achievements and challenges of Intergeo, a project co-funded within the eContentplus programme of the European Union.

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See detailThe project GeoGebraPrim - GeoGebra for Primary School
Kreis, Yves UL

Scientific Conference (2009, November 14)

S'adjunta un article que presenta el projecte GeoGebraPrim – GeoGebra for Primary School, una recerca finançada per la University of Luxembourg. Es dóna una ullada ràpida al projecte, s'expliquen els ... [more ▼]

S'adjunta un article que presenta el projecte GeoGebraPrim – GeoGebra for Primary School, una recerca finançada per la University of Luxembourg. Es dóna una ullada ràpida al projecte, s'expliquen els conceptes didàctics i tecnològics que s'hi incorporen, així com l'establiment d'uns grups-classe de control i uns altres grups per a l'estudi pròpiament dit, es comenten el pre-test i el post-test que es faran en connexió amb el treball amb GeoGebra i es presenten els primers resultats de l'estudi. [less ▲]

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See detailReport on Implementations of the Common File Format
Hendriks, Maxim; Kortenkamp, Ulrich; Kreis, Yves UL et al

Report (2009)

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See detaili2g Common File Format Draft v2
Hendriks, Maxim; Kortenkamp, Ulrich; Kreis, Yves UL et al

Report (2009)

Detailed reference viewed: 21 (0 UL)
See detailSoftware Development & Online Systems: Extensions
Hohenwarter, Markus; Kreis, Yves UL

Scientific Conference (2009, July 15)

The primary aims of this working group are to exchange ideas/plans for future extensions of GeoGebra and organise its developer community. Current projects include extending the statistics and spreadsheet ... [more ▼]

The primary aims of this working group are to exchange ideas/plans for future extensions of GeoGebra and organise its developer community. Current projects include extending the statistics and spreadsheet capabilities of GeoGebra and improving CAS integration into the software. In addition, some work has been already carried out on the 3D extension of GeoGebra. As an open-source project with a large user base, the future development of GeoGebra will be substantially influenced by the needs and desires of the GeoGebra user community and by the strength and cohesiveness of the GeoGebra developers. The focus areas of this working group include: * Features & Wishlist * Extensions: exploring possible extensions of GeoGebra features like Spreadsheet, CAS, 3D, etc. * Online Systems: integration into online systems like Moodle, Sage, WebWork, etc. * Wishlist & Roadmap: developing and evaluating a wish list for future extensions * Organization * User Community: new website, GeoGebraWiki, material manager * Developer Community: distributing work and managing the open-source developer community * Support * Projects: listing existing projects; developing ideas for research and development projects; * Funding: exploring resources for future developments and supporting developers [less ▲]

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See detailSoftware Development & Online Systems: CAS
Hohenwarter, Markus; Kreis, Yves UL

Scientific Conference (2009, July 14)

The primary aims of this working group are to exchange ideas/plans for future extensions of GeoGebra and organise its developer community. Current projects include extending the statistics and spreadsheet ... [more ▼]

The primary aims of this working group are to exchange ideas/plans for future extensions of GeoGebra and organise its developer community. Current projects include extending the statistics and spreadsheet capabilities of GeoGebra and improving CAS integration into the software. In addition, some work has been already carried out on the 3D extension of GeoGebra. As an open-source project with a large user base, the future development of GeoGebra will be substantially influenced by the needs and desires of the GeoGebra user community and by the strength and cohesiveness of the GeoGebra developers. The focus areas of this working group include: * Features & Wishlist * Extensions: exploring possible extensions of GeoGebra features like Spreadsheet, CAS, 3D, etc. * Online Systems: integration into online systems like Moodle, Sage, WebWork, etc. * Wishlist & Roadmap: developing and evaluating a wish list for future extensions * Organization * User Community: new website, GeoGebraWiki, material manager * Developer Community: distributing work and managing the open-source developer community * Support * Projects: listing existing projects; developing ideas for research and development projects; * Funding: exploring resources for future developments and supporting developers [less ▲]

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See detailIntergeo: fostering the use of Dynamic Geometry Software in Europe
Kortenkamp, Ulrich; Abánades, Miguel; Botana, Francisco et al

Scientific Conference (2009, July 13)

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See detailGeoGebra 3.2 – The new Spreadsheet View
Kreis, Yves UL; Hohenwarter, Markus; Hohenwarter, Judith

Scientific Conference (2009, July 12)

GeoGebra (www.geogebra.org) is a free, multi-platform, open-source dynamic mathematics software with rapidly growing worldwide popularity. The basic idea of the software is to join dynamic geometry ... [more ▼]

GeoGebra (www.geogebra.org) is a free, multi-platform, open-source dynamic mathematics software with rapidly growing worldwide popularity. The basic idea of the software is to join dynamic geometry, algebra, and calculus, which other packages treat separately, into a single easy-to-use package for learning and teaching mathematics from elementary through university level. So far GeoGebra’s user interface allowed algebraic (i.e. coordinates of points, equations) and graphical (i.e. points, function graphs) representations of mathematical objects. While coordinates and equations were displayed in the algebra view on the left hand side, their graphical representations could be seen in the graphics view on the right hand side. The release version 3.2 (available in April 2009) adds another – third – view: the spreadsheet view. Now various kinds of mathematical objects – not only numbers – can also be put inside spreadsheet cells. All representations of the same object are linked dynamically and adapt automatically to changes made to any of the representations, no matter how they were initially created. This enables users to connect statistical reasoning with other areas of mathematics. In this presentation we will introduce the new view, present some examples and discuss the opportunities it offers for the teaching and learning of mathematics. [less ▲]

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See detailGeoGebraPrim - GeoGebra for Primary School
Kreis, Yves UL; Dording, Carole

Scientific Conference (2009, July 11)

The aims of the project are on one hand the improvement of the children’s understanding of the elementary geometric concepts and on the other side a deeper insight in the bond of geometry and algebra. The ... [more ▼]

The aims of the project are on one hand the improvement of the children’s understanding of the elementary geometric concepts and on the other side a deeper insight in the bond of geometry and algebra. The study consists in a pre-/post-test scenario combined with observations of particularly interesting situations. All in all approximately 200 children of 9 years will participate; about half of them will follow a traditional paper/pencil geometry course while the others will be mixing experiences on the computer to the traditional ones. So far the existing Dynamic Geometry System GeoGebra has been adapted to the needs of the primary school through multiple observations of children working with the software. Besides it has been integrated into the TAO (Testing Assisté par Ordinateur – Computer-Assisted Testing) platform that will be used partially for the final test. In this presentation we will give a short overview of the project, explain the educational and technological concepts used and present first results of the study. [less ▲]

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See detailInternational GeoGebra Institute: nurturing a community to assist the integration of the open-source mathematics software GeoGebra into mathematics teaching
Kreis, Yves UL; Lavicza, Zsolt

Scientific Conference (2009, July 06)

GeoGebra is a free open-source dynamic mathematics software that is a versatile tool for visualizing mathematical concepts from elementary through university level. Without any promotion and organised ... [more ▼]

GeoGebra is a free open-source dynamic mathematics software that is a versatile tool for visualizing mathematical concepts from elementary through university level. Without any promotion and organised training GeoGebra has been discovered and used by tens of thousands of enthusiastic teachers and researchers around the world. In the past four years, an extensive self-supporting user community was formed by users of GeoGebra and they share interactive teaching materials on the GeoGebraWiki and support fellow users through the GeoGebraForum. Volunteers from this community have also translated GeoGebra to 42 languages offering great opportunity to use the software in local languages and in multicultural environments. To be able to support such extensive user community, we established the International GeoGebra Institute (IGI). The principle aims of IGI are to develop a platform to offer training and support for teachers and to coordinate research in relation to GeoGebra. During the past year, eight local GeoGebra institutes were established. In this talk, we will share our ideas about IGI and outline the current developments of this project. We hope to nurture a network of people who can contribute to any aspects of GeoGebra based on their interests. [less ▲]

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