An excellent Multiage Education website and Multiage Education Resources available on the web.
Critical Issue: Multiage Groupings
Another multi-age resource site.
A well-referenced thesis on multiage education.
An article inspired by a multiage program in England.
Many references and resources on multiage education compiled on archived rural education site, including downloadable pdf articles. Useful for both teachers and laymen.
Education in Japan
A resource site for parents who are educating their children in Japan. Homeschoolers, afterschoolers, unschoolers, traditional schoolers.
Link to Katoh Gakuen, in Shizuoka Prefecture which has an English Immersion Program.
This site gives links to extensive reading and information on constructivism which is the heart of multiage education.