Marianna Bosch is Professor at Universitat Ramon Llull, Spain. She is an experienced researcher in ATD with a long involvement in the dissemination of research to the international audience.Yves Chevallard is Professor Emeritus at Aix-Marseille Université, France and the main developer of ATD. Francisco Javier García is a researcher and lectuerer at Universidad de Jaén, Spain. John Monaghan is Emeritus Professor at the University of Leeds, UK and Professor at the University of Agder, Norway.

• Foreword Introduction Glossary Part 1: Unity in Diversity: ATD at Work Chapter 1. What kind of results can be rationally justified in didactics? Chapter 2. Research on ATD outside mathematics Part 2: Praxeological and Didactic Analysis Chapter 3. Praxeologies to be taught and praxeologies for teaching: a delicate frontier Chapter 4. Developments and functionalities in the praxeological model Chapter 5. Research on negative numbers in school algebra Chapter 6. The potential of reference epistemological models. The case of elementary differential calculus Part 3: Questioning the World Chapter 7. The Second Spanish Republic and the Project Method. A view from the ATD Chapter 8. The ecology of study and research paths in upper secondary school: the cases of Denmark and Japan Chapter 9. The need for new teaching praxeologies in the paradigm of questioning the world Part 4: ATD and the Teaching Profession Chapter 10. The studying of teachers' mathematical and didactic praxeologies as a tool for teacher education Chapter 11. The education of prospective early childhood teachers within the paradigm of questioning the world Chapter 12. The education of school and university teachers within the paradigm of questioning the world Chapter 13. On the contributions of the ATD to the teaching profession

Marianna Bosch is Professor at Universitat Ramon Llull, Spain. She is an experienced researcher in ATD with a long involvement in the dissemination of research to the international audience.Yves Chevallard is Professor Emeritus at Aix-Marseille Université, France and the main developer of ATD. Francisco Javier García is a researcher and lectuerer at Universidad de Jaén, Spain. John Monaghan is Emeritus Professor at the University of Leeds, UK and Professor at the University of Agder, Norway.

• Foreword Introduction Glossary Part 1: Unity in Diversity: ATD at Work Chapter 1. What kind of results can be rationally justified in didactics? Chapter 2. Research on ATD outside mathematics Part 2: Praxeological and Didactic Analysis Chapter 3. Praxeologies to be taught and praxeologies for teaching: a delicate frontier Chapter 4. Developments and functionalities in the praxeological model Chapter 5. Research on negative numbers in school algebra Chapter 6. The potential of reference epistemological models. The case of elementary differential calculus Part 3: Questioning the World Chapter 7. The Second Spanish Republic and the Project Method. A view from the ATD Chapter 8. The ecology of study and research paths in upper secondary school: the cases of Denmark and Japan Chapter 9. The need for new teaching praxeologies in the paradigm of questioning the world Part 4: ATD and the Teaching Profession Chapter 10. The studying of teachers' mathematical and didactic praxeologies as a tool for teacher education Chapter 11. The education of prospective early childhood teachers within the paradigm of questioning the world Chapter 12. The education of school and university teachers within the paradigm of questioning the world Chapter 13. On the contributions of the ATD to the teaching profession

Marianna Bosch is Professor at Universitat Ramon Llull, Spain. She is an experienced researcher in ATD with a long involvement in the dissemination of research to the international audience.Yves Chevallard is Professor Emeritus at Aix-Marseille Université, France and the main developer of ATD. Francisco Javier García is a researcher and lectuerer at Universidad de Jaén, Spain. John Monaghan is Emeritus Professor at the University of Leeds, UK and Professor at the University of Agder, Norway.

• Foreword Introduction Glossary Part 1: Unity in Diversity: ATD at Work Chapter 1. What kind of results can be rationally justified in didactics? Chapter 2. Research on ATD outside mathematics Part 2: Praxeological and Didactic Analysis Chapter 3. Praxeologies to be taught and praxeologies for teaching: a delicate frontier Chapter 4. Developments and functionalities in the praxeological model Chapter 5. Research on negative numbers in school algebra Chapter 6. The potential of reference epistemological models. The case of elementary differential calculus Part 3: Questioning the World Chapter 7. The Second Spanish Republic and the Project Method. A view from the ATD Chapter 8. The ecology of study and research paths in upper secondary school: the cases of Denmark and Japan Chapter 9. The need for new teaching praxeologies in the paradigm of questioning the world Part 4: ATD and the Teaching Profession Chapter 10. The studying of teachers' mathematical and didactic praxeologies as a tool for teacher education Chapter 11. The education of prospective early childhood teachers within the paradigm of questioning the world Chapter 12. The education of school and university teachers within the paradigm of questioning the world Chapter 13. On the contributions of the ATD to the teaching profession