We present Madeus, an authoring environment for interactive multimedia documents. Madeus 'aim can be sumed up in the following statement : high temporal expressivity must not be reached to the detriment of a user-friendly interjace editing approach. We provide the author with a declarative and hierarchic speciJication language based on an extension of Allen's algebra. Static temporal checking and dynamic scheduling are based on an extension of temporal constraint networks.

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OPE~project, m Rh6ne-Apes. 655 a~'enue de I'Europe, 38330 Montbonnot, Rance. m~{Firstname.Lastname} @inrialpes.fr tek +33 476615200, f= +33 476615252 http//opera.inri~pes.fr/OPEU/ Abstrab thispaper, we present the main rdtswe have ob tained through our &xTtience in designing~d implementing JIadeus,~authoring and presentation tool for interactive mtitimedia documents. This system do= an~cient support for the spetimtion of temporal scenarios and fits in m artitecture that Mom the btegration of both authoring ad presentation phases of mtititnefia do~ertts. lloreover, we show that constrtits are wd suited for the devdoprnent of both end-user graphic interfxes and &cient low-levd mewtion mechanisms.

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