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Published online by Cambridge University Press: 25 September 2002
The exquisite astrometric data to be delivered by GAIA can only besuccessfully exploited if complemented by accurate astrophysicalinformation on all observed objects. In this contribution I willdiscuss the preparations that are necessary for obtaining thisinformation. The emphasis will be on the task of optimising the GAIAphotometric system and the development of photometric data analysisalgorithms.