Full documentation is not yet available, but here is the very basic information on how to start using ACT-R 6. Load the load-act-r-6.lisp file into your Lisp application (currently ACL 6.2, 7.0, & 8.0, MCL 5.0 and 5.1, OpenMCL 0.14.3, CMUCL 19a, CLisp 2.38 and LispWorks 4.3 and 4.4 are the only ones that have been tested). Notes: - for MCL you must use the "Load Unix" option on the file memu. - for CLisp you need to remove the environment-loader.lisp file from the tools directory (the ACT-R environment will not be available). That will load everything and you are ready to start working. If you would like to use the ACT-R Environment GUI then you need to do two things. First, run the Environment Application which can be found in the environment directory. In Windows you should run the "Start Environment.exe" application and on Macs with OS X it's the "Start Environment OSX" application. If you are using Unix or Linux and have Tcl/Tk installed you can start it by running the starter.tcl script located in the GUI directory of the environment. The "Control Panel" window will appear on the right of your display saying "Waiting for ACT-R" at the top. Once that's there you now need to call start-environment from Lisp. That will connect ACT-R to the GUI tools and lots of buttons should now be available on the "Control Panel". When you are done, you should call stop-environment from Lisp before quitting to make sure the GUI closes down properly. If you have any questions or comments please send them to Dan (db30@andrew.cmu.edu).