OOM V2 Program
OOM is being offered as freeware. The program is still copyrighted by Elsevier and James W. Grice, Ph.D.
No aspect or feature of OOM or the program code may therefore be reproduced or altered without written permission.
Please read the following disclaimer:
OOM is provided on an “as is” basis without a warranty of merchantability or warranty for fitness for a particular purpose or any other warranties whether expressed or implied. OOM may contain bugs, errors, and other problems that could cause system failures or may not perform all functions for which it is intended. Any program should be thoroughly tested with non-critical data before relying on it, and the user must assume the entire risk of using OOM. Liability of the software copyright holder will be limited exclusively to replacement of the OOM software.
By downloading and installing OOM you are acknowledging that you have read and agreed with this disclaimer.
Newest Version
The new version is here! We have tested it extensively, but bugs may remain. Please e-mail me if you encounter any issues or if you have questions, comments, or suggestions [james.grice@okstate.edu].
What Installs:
1. oom.exe (the program is a single, executable file)
2. User’s Manual in Adobe Acrobat (pdf) format
3. Folder of example OOM files referenced in the manual and 2001 book
These materials will be found in the folder to which you install OOM during download and they will occupy ~19MB of disk space.
OOMInstall_1_31_2026.exe
(Updated: Jan. 31st, 2026, ~16MB)
Some browsers are not automatically downloading/executing the file when the link is clicked. Keep an eye on the upper-right corner of your browser for a download symbol or exclamation point notifying you that the download has been temporarily blocked. You can override the block to “keep” the download. You can also try clicking the link with your right mouse button and choosing “Save link as…” from the popup menu. After saving the executable file, you should be able to run it. You can also try saving this zipped file to your computer (right click and select “Save link as…”), and then open/run the executable file enclosed.
As an alternative, you can try downloading this .zip file which, when unzipped contains the install .exe file.
OOMInstall_1_31_2026.zip
When you install OOM using the OOMInstall.exe link above, the program, the software manual, and example data files used in the Observation Oriented Modeling book and software manual will all be copied to your computer. Using the default settings, the files will install in the “C:/Program Files(x86)/OOM” subdirectory in most versions of Windows.
Previous Versions
OOMInstall_10_21_2023.exe
(Updated: Nov 17th, 2022)
OOMInstall_11_17_2022.exe
(Updated: Nov 17th, 2022)
OOMInstall_5_4_2022.exe
(Updated: May 4th, 2022)
OOMInstall_5_27_2020.exe
(Updated: May 27th, 2020)
Older Version
OOMInstall_4_27_2020.exe
(Updated: April 27th, 2020)
(Here is the oom.exe file if you wish to simply overwrite that file)
If you have an older version of OOM, this install should uninstall it before updating. If not, uninstall the old version and then install this new version.