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The purpose of this paper is to investigate the long-term impact of participating in school-based lesson study on mathematics teachers' professional community.

A study was conducted with six mathematics teachers, from two post-primary schools in the Republic of Ireland, following up on their participation in school-based lesson study over the academic year 2012/13 (see Ni Shuilleabhain, 2016). Qualitative data were generated through one-to-one, semi-structured interviews with the participating teachers and analysed using an empirical framework for teacher community formation (Grossman et al., 2001).

Analysis of the interview responses suggests that the mathematics teachers in both schools, Doone and Crannog, had developed a mature professional community during their participation in lesson study in 2012/13. Furthermore, the research finds that, in the absence of any other professional development intervention, both teacher communities have been sustained at this level six years later. These findings suggest that a lesson study may serve as a potential structure to foster the development of sustainable professional communities within subject-based teacher groups.

While a lesson study has been shown to support the development of teacher professional communities, previous research has not addressed the sustainability of the communities which emerge. This study, therefore, adds to the existing literature by investigating teachers' perceptions of the long-term impact of lesson study participation on their professional community.

The purpose of this paper is to investigate the development of mathematics teachers’ pedagogical content knowledge (PCK) over successive cycles of lesson study. Utilising the framework of mathematical knowledge for teaching (MKT) (Ball et al., 2008), this research classifies features of PCK as utilised by post-primary mathematics teachers in their planning and reflection conversations in lesson study. The development of these features of PCK is then traced over successive cycles.

In total, 12 teachers in two Irish post-primary schools participated in this research. Over the course of one academic year, these two groups of teachers completed a number of cycles of lesson study and qualitative data were generated through audio recordings of all lesson study meetings and through individual interviews with participants.

Analysis of teacher dialogue reveals distinct features of knowledge of content and students (KCS) and knowledge of content and teaching (KCT) incorporated by these teachers in their planning and reflection conversations, providing empirical evidence of MKT in lesson study. The occurrence of these features of KCS and KCT in lesson study conversations increased over successive cycles, demonstrating teacher learning.

This research contributes to the literature in expanding the theoretical underpinnings of teacher learning in lesson study. It also provides further empirical evidence of MKT (Ball et al., 2008) in teacher practice, specifically related to post-primary mathematics teachers.