The Lesson Study approach is a method of professional development that encourages teachers to reflect on their teaching practice through a cyclical process of collaborative lesson planning, lesson observation, and examination of student learning.
The Lesson Study Network in the Graduate School of Education, University of Exeter, aims to promote understanding about lesson study and related practices (learning studies) in their contexts and across varied phases of education, to support further thinking and research about developing lesson study practices in ITE and CPD and to examine knowledge exchange and other lesson study processes. Through this network there is access to resources and guidance on lesson study within schools. http://blogs.exeter.ac.uk/lessonstudynetwork/
The Lesson Study UK website, launched by Dr Pete Dudley, also contains a wealth of information and resources for teachers.