  Interactive Scores (IS) are a formalism for the design and performance of
interactive multimedia scenarios. IS provide temporal relations (TR), but they
cannot represent conditional branching and TRs simultaneously. We propose an
extension to Allombert et al.'s IS model by including a condition on the TRs.
We found out that in order to have a coherent model in all possible scenarios,
durations must be flexible; however, sometimes it is possible to have fixed
durations. To show the relevance of our model, we modeled an existing
multimedia installation called Mariona. In Mariona there is choice, random
durations and loops. Whether we can represent all the TRs available in
Allombert et al.'s model into ours, or we have to choose between a timed
conditional branching model and a pure temporal model before writing a
scenario, still remains as an open question.
