NetLogo is a platform specifically for agent-based modeling: it
conceptual approach, a high-level programming language, graphical
automated simulation experiments, etc. NetLogo is free; available for
MacIntosh, and Linux computers; and includes very complete and
professional documentation and tutorials. NetLogo was written by Uri
Wilensky, who founded and directs the Center for
Connected Learning and Computer-Based Modeling
at Northwestern University, where NetLogo is developed and maintained.
NetLogo can be downloaded from
The NetLogo programming information and example models in
Agent-based and Individual-based Modeling: A Practical Introduction,
and on this site, use the current Version 5.0 of NetLogo.
(Specifically, the NetLogo codes on this web site were last revised in
NetLogo version 5.0RC2, released in October 2011.)
However, our book's text was finalized just as the first preliminary version of
NetLogo 5.0 was released, so the book's text and figures do not fully represent,
or make full use of, the changes between versions 4.1 and 5.0.
Here are characteristics of NetLogo 5.0 that are not fully implemented in our book.
All the NetLogo code in the book should
still work in version 4.1. However, the NetLogo programs provided
on our downloads page generally do not work when opened in NetLogo 4.1;
plots created in version 5.0 appear to lose their
pen names (referred to in the code by set-current-plot-pen) when opened in 4.1.
This problem is easily corrected by editing the plot to add the pens that are
referred to in the code.
When you produce and publish work using NetLogo, please remember to cite it
correctly and to comply with its copyright. Information on citations and the
copyright are built into NetLogo: click on "Help" in the main menu and
select "About NetLogo".
We strongly encourage you to contribute to the NetLogo project at Northwestern University via
web site. You can, for example, include a contribution
in your course fee or in your research project budget. (We have never had a funding
agency question a "software support" budget item that contributes to
a free software platform such as NetLogo.)
Having problems installing, running, or programming NetLogo? We cannot help you directly because NetLogo already has excellent user support resources. Try these:
The NetLogo User Manual (just click "help" in NetLogo), including its tutorials, interface and programming guides, and FAQ.
The "Code examples" section of NetLogo's built-in Models Library. This should be one of the first places to look to learn how to do something new.
The NetLogo Users Group email list, which you can find from NetLogo's help menu (just click "help", then "NetLogo Users Group"). This is an on-line forum that all NetLogo users should belong to. You can post questions to the group, but please be kind to the nice people who answer questions (out of kindness and love of NetLogo) by first searching the group's email archives thoroughly to make sure your question has not already been answered.
James Steiner's excellent and fascinating TurtleZero site, which includes links, downloads, FAQs, and a NetLogo wiki.