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With decision support systems, decisionmakers analyse data in data marts extracted from production bases. The data-mart sche ma design is generally performed by expert designers (administrator or com puter specialist). With data-driven, requirement-driven or hybrid-driven ap proaches, this designer builds a data-mart defining facts (analysis subject s) and analysis axes. This process, based on data sources and decision-makers requirements, often turns out to be approximate and complex. We propose to de sign a data-mart schema by the decision-maker himself, following a hybrid-d riven approach. Using an assistance process that visualises successively int rmediate schemas built from data sources, the decision-maker gradually builds h is multidimensional schema. He determines measures to be analysed, dimensions h ierarchies within dimensions. A CASE tool based on this concept has be en d veloped.

COMPUTER-AIDED DATA-MART DESIGN