Concurrent System Description Language.

This report describes an effort to develop a concurrent system description language CSDL. The development of the notation is based on studies of approaches to modeling, designing, decomposing, describing, analyzing, and deriving simulations of concurrent processing systems. The devised notation is based on a computational model which represents systems as a collection of communicating concurrent activities. CSDL takes an architectural approach viewing concurrency as a relationship among activities, rather than a concurrent programming approach viewing concurrency as a control construct. The model does not distinguish between hardware and software realizations. The notation integrates statements about the performance of concurrent processing systems. The basic principles of CSDL include data abstraction and refinement, hierarchies of abstract machines and their decomposition, representation of system requirements and design solutions for all system components.