A distributed control and data base system for the production of high quality crystals

The construction of the high precision crystal electromagnetic calorimeter of the CMS experiment at LHC will require about 3 production factories and 4 assembly sites spread over the world, and will last 5 to 6 years. A quality control scheme will have to be setup to achieve the required performances. It will imposes methods like the ISO 9000 quality insurance scheme, and the use ob object-oriented database for storing the information, with a query and control system based on W3 to make the analysis accessible to any member of the world-wide collaboration. (author)