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The purpose of this paper is to elaborate on the commonality between the Theory of Didactical Situations (TDS) and lesson study to propose a model of lesson study using both the predominant graphical representation of lesson study by Lewis and the model of the didactical situation at the heart of TDS by Brousseau.

Starting by describing and adapting the predominant graphical representation of lesson study by Lewis and the model of the didactical situation at the heart of TDS by Brousseau, the paper integrates the two representations to highlight the commonalities between the students’ learning situation and the teachers’. Based on this integrated graphical representation, the key phases of lesson study are then conceptualised by the mean of the dialectic between didactical and adidactical situation.

The reflection about the use of the TDS graphical representation embedded in the lesson study diagram helps the reflection on the use of TDS itself to analyse lesson study. This theoretical analysis describes the process of teacher learning in lesson study and the link between their learning and the student’s. It also shows that lesson study is a good candidate for the fundamental situation of the knowledge for teaching.

The graphical conceptualisation of lesson study as a learning situation for teachers offers new insight about how teachers learn in lesson study.

This article aims to evaluate the current state and planned progress of lesson study (LS) in Switzerland, specifically focusing on the efforts made by different university teacher education institutions across three language regions of the country.

First, a literature review is carried out to establish the LS research situation in Switzerland. In a second step, LS projects implemented in three different language regions across Switzerland and key findings thereof will be presented.

LS in Switzerland has progressed in terms of research, as can be seen from the publication of 18 papers from seven different universities and classified into three categories. The majority of these papers stem from the Lausanne Laboratory Lesson Study. Swiss LS has also attracted attention in some neighbouring countries. Nevertheless, the sustainability of the LS process in Switzerland is still in its infancy. Some unfavourable factors are due to the cantonal and versatile structure of the Swiss education system. However, thanks to the centre of expertise for LS at Lausanne University of Teacher Education, LS is expanding to other regions of Switzerland.

While this paper does not delve into extensive research on the development of LS in Switzerland, it highlights the need for further research to analyse the conditions and constraints impacting the sustainability of learning communities in the country.

This paper represents the first literature review specifically addressing LS in Switzerland, offering a comprehensive assessment of its research development. Additionally, it is the first study to examine the development of learning communities across different language regions of the country. Moreover, it shows how LS can be implemented and adapted to the varied educational preconditions in Switzerland.

The article presents the construction of a conceptual framework, which is rooted in mathematics education and in dialogic analysis. It aims to analyse how dialogic interactions contribute to constructing teachers' mathematical problem-solving knowledge. The article provides one example of this analysis.

The networking between a content analysis framework (Mathematical Knowledge for Teaching Problem-Solving) and a dialogic analysis framework (Lesson Study Dialogue Analysis) is presented. This leads to the construction of indicators to quantitatively and qualitatively code our data: five meetings during one lesson study cycle of a group of eight Swiss primary teachers, working on the teaching of problem-solving.

This article does not present empirical findings. The developed conceptual framework is the result presented.

The presented framework allows modelling, on the one hand, the knowledge relating to the teaching and learning of problem-solving and, on the other hand, the analysis of interactions during a lesson study. The article does not contain the results of the research.

The use of our framework can contribute to teacher educators' and facilitators' training by highlighting which types of intervention are favourable to the development of knowledge.

Our analysis involves a “systematic coding” approach. It allows a fine-grained analysis of the interactions in relation to the evolution of knowledge. Such a systematic approach offers the possibility of questioning the coded data in various ways.

The purpose of this poster is to present the new Lausanne Laboratory Lesson Study.

It stresses the links between six dimensions of this research center.

The poster provides a list of current researches and a list of publications.

This research center is the first about Lesson Study in French-speaking countries.

The purpose of this paper is to present French Didactique des Mathématiques (DM) to the Lesson Study (LS) community.

This theoretical paper presents the origins of DM in the Theory of Didactical Situations (TDS) by Brousseau. It elaborates about didactical engineering, fundamental situation and other fundamental concepts. It briefly presents other Didactique theories: the theory of conceptual fields, the anthropological theory of the didactic, the joint action theory in didactics and the double approach. It considers importance of the (TDS) and influences over teaching of mathematics. This paper finishes by highlighting the ways Didactique and LS could contribute to each other in a profitable dialogue.

The paper contrasts DM with some LS main features. It highlights the parallels despite fundamental differences in the initial goals of the perspectives. It shows that these differences could lead to productive dialogue by producing more practice-oriented forms of didactical engineering for the first and making teachers’ principles for lessons more explicit for the latter.

The paper presents a very quick overview of the parallels between DM and LS. Additionally, this paper gives many accessible references in English for the reader to explore Didactique further.

The purpose of this paper is to provide an introduction of the papers in the current issue.

By revealing contrasting features of alternative theories of learning, this paper offers a contribution to the on-going discussion about the role of learning theory in Japanese lesson study and its global adaptations.

Attempts to theorize lesson study in contrast to the theory-based learning study reveal a fundamental difference in the learning theories used to underpin this task related to the different world views on which they are founded.

This paper review provides an overview of the insights into lesson and learning studies provided by the authors in this issue of the journal.

This study aims to clarify the process of students' discussion in a problem-solving lesson developed autonomously by a teacher. It is expected to contribute to the accumulating and theorizing of teachers' professional development in school-based curriculum studies.

A transcript-based lesson analysis (TBLA) was conducted using quantitative and qualitative methods. The data were from a third-year junior high school social studies lesson in which whole-class discussions took place. The frequency of the appearance of keywords in the utterances was represented in the form of cumulative relative frequency graphs, and a diagram of the students' discussion process was drawn based on them.

The diagram confirmed the frequent occurrence, disappearance and transmission of keywords in the process of the lesson. The interpretation of the lesson transcript revealed that the students listened carefully to others' utterances, shared important keywords and examined the ideas critically. They were supported in identifying the connections between their interests by the teacher. The students' interactions and teacher's interventions were facilitated by the integrated curriculum design of teaching and learning.

This study verifies that students' collaborative and critical learning takes place in a lesson developed by a teacher based on the practiced curriculum. The findings of this study suggest that lesson study (LS) focusing on the words in utterances provide clues for evaluating the practiced curriculum and reveal the teacher's professional development.