ACT-R 5.0 is not the current version of the ACT-R system. It was last updated on April 22, 2004.

The current ACT-R software is available from the Software page.

Source Files

The source files are available in this zip file.

To use them, after unpacking the files, load the file called "+ load-rpm.lisp". That will compile all of the files and load them.

The ACT-R Environment

The ACT-R Environment is a set of GUI tools for running, inspecting, and debugging ACT-R models. It is used primarily with the tutorial when teaching ACT-R, but has features that can be beneficial to even the veteran ACT-R modeler.

Installation information and system requirements for the ACT-R Environment are available in this manual.

The files needed for the ACT-R Environment differ by operating system and the following versions are available:

Standalone ACT-R

There is also a standalone version of ACT-R available for Windows and for Mac OS X (10.2 or newer) which runs without the need of having either Lisp or Tcl/Tk installed.

To install the Windows version

After extracting the files from the .zip, run the setup.exe program to install it (you’ll have to have administrator privileges to run the installer but not the environment itself). When that finishes it’s ready to go, and all you need to do is run the “Start Environment” application. If you would like to uninstall it, you should do so from the Control Panel’s “Add or Remove Programs” interface.

To install the Mac OS X version

The only installation necessary is to copy the ACT-R folder from the disk image to the /Applications folder on the local drive and copy the “start ACT-R OSX.term” file from the disk image to any where on the local drive. Then, all you need to do to run the environment is double click that .term file (thanks go to Hedderik van Rijn for that easy startup mechanism).

Tutorial Units

The texts for the ACT-R 5.0 tutorial units are available in this zip archive.

All of the models for the ACT-R 5.0 tutorial are available in this zip archive.

Additional Material

A manual that describes the new toolkit for building experiments for ACT-R in Lisp (the AGI – ACT-R GUI interface).

A parameter reference for the SGP command.