Lesson Study (jugyou kenkyuu) is a collaborative professional development model originating in Japan, where it has been practised for over a century. A small group of teachers (typically 4–6) jointly plan a single "research lesson," one member teaches it while the others observe, and then the group analyses what happened, with the focus squarely on student learning, not teacher performance.
The model was introduced to the English-speaking world primarily through Stigler & Hiebert (1999) and Lewis (2002), and has since spread widely in general education. Its application in ELT is growing but still underrepresented relative to its potential.
The group selects a question about student learning: How can we help students develop more coherent paragraph structure? Why do students avoid using new vocabulary in speaking tasks? The question drives the entire process.
The group designs a single lesson in detail: not just activities and timing, but anticipated student responses, potential misconceptions, and what evidence of learning to look for. This planning phase is where most of the professional learning occurs.
One teacher delivers the lesson while the others observe. Observers do not evaluate the teacher; they collect data on student learning: What did students say? What errors appeared? Who was engaged and who was not? How did students respond to key tasks?
The group discusses the observation data. Questions focus on learning outcomes: Did students achieve what we intended? What evidence tells us? Where did the lesson design help or hinder learning?
The group revises the lesson based on findings and, ideally, another member teaches the revised version to a different group. This iterative cycle, plan → teach → observe → revise → reteach, is the engine of improvement.
The group documents insights and shares them with the wider teaching community through a report, presentation, or open research lesson.
| Feature | Typical PD | Lesson Study |
|---|---|---|
| Focus | Teacher behaviour | Student learning |
| Observation purpose | Evaluate the teacher | Collect evidence about learning |
| Planning | Individual | Collaborative: the lesson belongs to the group |
| Knowledge source | External expert | Emerges from collaborative inquiry |
| Duration | One-off session | Extended cycle (weeks to months) |
| Outcome | Tips and techniques | Deepened understanding of teaching and learning |
The critical distinction is the focus on student learning. Observers are not asking "Was the teacher good?" but "Did the students learn what we intended, and what evidence tells us so?" This removes the evaluative pressure that makes classroom observation threatening and replaces it with collaborative inquiry.
Applications in language teaching: