"Learning Note" that Helps Teachers' Lesson Study Across Time and Space

Renovation of education requires students to engage in a newer style of learning, or collaborative learning. For the design of such a lesson, teachers need to develop a new type of knowledge: pedagogical content knowledge (PCK) and horizon content knowledge. Mere sharing of lesson materials makes little contribution to such knowledge development, since the materials are only end products, and do not include their development processes. Thus, we developed a digital teaching platform, the “Learning Note”, which links discussions on lesson design with lesson materials, while laying out the materials on unit maps for teachers to acquire a horizontal view of long-term learning processes. This paper explains the overall results of how the teachers used this platform, showing the example of a novice teacher who managed to design a lesson in the course of a unit with the help of her colleagues. We propose that the digital teaching platform enables teachers to engage in continuous lesson study across time and space. © 2023, The Author(s), under exclusive license to Springer Nature Switzerland AG.