From Journal of Educational Change.
This paper features a case study of one US K-8 school district pioneering the use of ‘‘lesson study,’’ a teacher professional development approach adapted from Japan. The case explores events that occurred in the district over more than 4 years (Spring 2000–Fall 2004) as lesson study spread nationally and within the district. We document four categories of changes that occurred in the district’s lesson study approach, and describe some of the early consequences of these changes as well as conditions that enabled the changes to occur. We argue that this case illustrates much of what we would hope to see in a maturing lesson study effort, and conclude that other US sites may need to go through similar changes, organize similar supports, and persist in their learning about lesson study to successfully adapt this model to their local contexts.