In 2005, the Institut National du Patrimoine of Tunisia played host to the ninth Triennial meeting of the International Committee for the Conservation of Mosaics (ICCM). The meeting focused on assessing past practices of mosaic conservation, both in situ and in museums."Lessons Learned" is a richly illustrated volume that provides readers with a comprehensive record of the conference proceedings.The fifty-three papers - with contributions from more than 80 leading professionals in the field - reflect the conference's principle themes: Evaluating Mosaic Practice, Caring for Mosaics in Museums, Documenting and Assessing Sites at Risk, Managing Sites with Mosaics, Sheltering Mosaics, and Training of Conservation Practitioners.