The latest ITU-T standard syntax of Message Sequence Charts (MSCs) [16] offers several operators to compose MSCs in a hierarchical, iterating, and nondeterministic way. However, current tools operate on MSCs that describe finite, deterministic behavior. In this paper, we describe the architecture and the partial implementation of MESA, an MSC-based tool that supports early phases of the software development cycle. The main functionalities of MESA are: an environment for the composition of system models through MSCs, syntactic and model-based analysis of an MSC model, and resolution of resource related underspecifications in an MSC model.
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