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Information in this document is subject to change without notice and does not constitute a representation or warranty on the part of Ventana Systems, Inc.  The software described in this document is furnished under a license agreement and may be used or copied only in accordance with the terms of that agreement.  


© Copyright Ventana Systems, Inc.

All Rights Reserved except the Following Reproduction Rights are Granted:

This documentation may be reproduced by, or on behalf, of Vensim Licensees for their own use and by schools and accredited academic institutions for instructional and research use.  Any other reproduction is prohibited without the express written consent of Ventana Systems, Inc.  This page must be included in any reproduction of any part of  Vensim documentation.

Vensim is Licensed software and may only be used in accordance with the terms of that license.  The Vensim PLE Software may be reproduced and distributed free of charge as a bound, self  installing executable.  Any sale of Vensim software is prohibited without the express written consent of Ventana Systems, Inc.  Any distribution of the files installed in support of Vensim is prohibited without the express written consent of Ventana Systems, Inc.

Patent and Trademark Notices

Causal Tracing, Reality Check, Vensim and Ventana are registered trademarks of Ventana Systems, Inc.  Venapp, SyntheSim and the Ventana Logo are trademarks of Ventana Systems, Inc.  Ventana is a registered service mark of Ventana Systems, Inc.  Vensim is covered by United States Patents 5,428,740 and 5,446,652.  Patents are pending in the United States and other countries related to portions of the Vensim software.

Other brand or product names are trademarks or registered trademarks of their respective owners.



Ventana Systems gratefully acknowledges researchers who make their code available under liberal licenses suitable for inclusion in a commercial product.

Vensim 6.3+ uses the SIMD implementation of the Mersenne Twister pseudorandom number generator, subject to the following license:


Copyright (c) 2006,2007 Mutsuo Saito, Makoto Matsumoto and Hiroshima


Copyright (c) 2012 Mutsuo Saito, Makoto Matsumoto, Hiroshima University

and The University of Tokyo.

All rights reserved.


Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions are



    * Redistributions of source code must retain the above copyright

      notice, this list of conditions and the following disclaimer.

    * Redistributions in binary form must reproduce the above

      copyright notice, this list of conditions and the following

      disclaimer in the documentation and/or other materials provided

      with the distribution.

    * Neither the names of Hiroshima University, The University of

      Tokyo nor the names of its contributors may be used to endorse

      or promote products derived from this software without specific

      prior written permission.