Booth and Ainscow;s Index for Inclusion: Developing Learning and participation in schools (2002) has been out there for some time now and used in UK schools in particular. http://www.eenet.org.uk/resources/docs/Index%20English.pdf
Enough time has passed; What do we think of the 1. definitions, 2. relationships 3. understanding of classrooms as communities and 4. implementation of the index in inclusive education?