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We recently published a new dataset for Dr. Aoibhinn Ni Shuilleabhain called ‘ Mathematics Teachers Participating in Lesson Study: Two Case Study Sites’. This dataset tracks the experiences of mathematics teachers in two post-primary schools in Ireland, as they begin engaging in Lesson Study to support them in enacting the new mathematics curriculum. The research tracks teachers’ interactions and engagement over a number of successive cycles in two schools. This dataset is open and can be viewed on the DRI repository