Abstract
DISCO is a SIMULA-based language for the simulation of systems which contain both continuous and discrete- event processes. It is a true extension of SIMULA's concepts for discrete-event simulation and is capable of representing and analyzing models including both types of processes. With the addition of few new con cepts, a general yet simple simulation language has been achieved. This paper describes the basic concepts of DISCO and demonstrates through examples the descriptive power of the language. DISCO is described mainly from the user's point of view; its implementation is only sketched.