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In this article, we focus on the issues of temporal
specification in multimedia and hypermedia. In the past years,
many temporal modelshave been proposed for multimedia, such as
Refined Temporal Model,Petri-Net, Interval-based Approach, Basic
Hierarchical Specification, and Reference Points. Among them,
the Refined Temporal Model (RTM), based ongraph and
visualization, is a powerful and simple one.But RTM has also
some disadvantages. First, it cannot be used to express
thehierarchical structure of a multimedia document. Second, when
many user interactionshave to be presented, the flow of
scenarios will become more complexthan RTM can handle.Based on
the above observations, a new Scenario Copntrol Graph (SCG)
model is proposed.
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