SIGMA Release 2.1 - Tapa dura

Sigma (Simulation Graphical Modeling and Analysis) is an interactive graphics approach to discrete event simulation. It was specifically designed to make simulation modelling easy by allowing users to build, test and experiment with simulation models on personal computers. In Sigma, stochastic discrete event systems are represented as simple dynamic graphs. A few mouse clicks and Sigma produces an animation of the model. The users maintains complete control because they have complete access to their simulation source code. Sigma models are transparent: the model is the language.