Because Venapps work by shifting from one screen to another, there are no real restrictions on logical flow. Both linear and hierarchical menu systems can be implemented. It is up to you to decide how you want to organize your application. The Vensim Demo, for example, has a linear logical flow describing the features and value of Vensim, with generally hierarchical control inside of the example applications. Most of the examples, however, break from the pure hierarchy by providing links from simulation to analysis and back again.
