Vensim, the Ventana Simulation Environment, is an integrated framework for conceptualizing, building, simulating, analyzing, optimizing and deploying models of complex dynamic systems. Vensim uses a workbench-toolbox design that combines the simplicity of visual models with easy access to a host of powerful model simulation and analysis tools, yielding a spectacular increase in the speed of your work and the quality of your results. A Family of Products Vensim is available for both PC and Macintosh and comes in three different configurations so that you can choose the functionality you need. The standard Vensim allows you to create, articulate and simulate models, showing structure and simulating behavior. Vensim Professional adds more advanced modeling capabilities and enables optimization of model performance. Vensim DSS increases model capacity and provides tools for building decision support systems and learning simulators. Migration of models among configurations and platforms is seamless. Vensim offers the choices to fit your needs. Vensim Helps Creativity Vensim provides a flexible approach to creating models by allowing you to include ideas, build diagrams and, when appropriate, move into a formal simulation model. Your modeling can start with causal loop diagrams, equations, or stock and flow diagrams. Models can also be imported from other applications, providing the user with Vensim's powerful analysis and optimization tools. Vensim is designed to let you work the way you want to work. Vensim is Powerful Vensim makes it effortless and fun to move in and understand why a model is doing what it is doing. Powerful loop tracing tools, graphical comparisons, optimization tools and other utilities allow thorough analysis for in-depth understanding of complex systems. Vensim's standard configuration provides a powerful integrated environment for the development and analysis of complex dynamic feedback models. Causal Loop Diagrams Vensim makes building and annotating causal loop diagrams simple and straightforward. Just enter the concepts and connect them with arrows. Vensim maintains the connections, keeping structure while allowing you to rearrange and customize the diagram in many different ways. Stock and Flow Diagrams Vensim supports you in creating stock and flow diagramming to represent systems in greater structural detail. Stocks and flows can be mixed with causal loops to clearly distinguish the different system components. For further information please refer to the home page of Ventana Systems Inc (www.vensim.com).