This paper presents a visual environment for building process simulators wh
ich is specifically aimed at integrating the construction of a model and th
e organizational of the corresponding simulation code, providing the user w
ith easy and extensive control of both phases. The environment relies entir
ely on a graphical programming language, which permits easy creation of fle
xible and effective user interfaces for the simulators. It adopts a modular
approach, so as to simplify its maintenance and extension. A real-size cas
e is treated to demonstrate the capacity of the proposed environment.