Easy to learn, use and work simple simulation to most complex ones. I used Vensim in my research to develop a system dynamics models for different construction management problems, I highly recommend it because of the ease of building models, friendly user interface, and the available explanation examples are very helpful.

Lucid tools make Vensim an easy source to understand the concepts and utilize it.

Vensim models Process flow charts, loops and arrows, graphs and results!