This work presents MUSE, a graphical environment for modeling interactive networked multimedia applications. Through an advanced graphic interface and a new high-level authoring model, it is possible to create complex systems in a fast and intuitive way. The authoring model proposed in this work and adopted by the tool deals with media objects distributed in a computer network, allowing the definition of acceptable delay thresholds and alternative media objects. Due to the large expressiveness of the model, however, specifications with logical and temporal inconsistencies may be generated. For this reason, the tool also provides E-LOTOS specifications used with the purpose of analyzing and verifying the applications aiming at validating the temporal requirements defined by the author.