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Some problems in the design of combined languages

The purpose of this article is to air some problems and issues I have encountered on trying to derive principles for the design of combined continuous-discrete simulation languages for digital computers [1, 2, 3, 4, 5]. The presentation is intended to provoke discussion rather than to provide definitive analysis. I am especially conerned with: interaction between parallel' components; discontinutuity and the discrete/continuous dichotomy; and state-events.