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+# Preference Dictionary
+
+## Introduction
+
+This reference document describes the elements of the ISIS Preference file.
+
+## Types of Preference Files
+
+### System Preference File
+
+Your local ISIS administrator manages a system-wide preference file. The file $ISISROOT/IsisPreferences, is in Parameter Value Language (PVL) format, and contains specifications for how ISIS should operate. For example,
+
+```
+Group = UserInterface
+ ProgressBarPercent = 10
+EndGroup
+```
+
+### User Preference File
+
+The user can override elements of the system wide preference file by creating a personal preference file. The file must reside in the hidden directory $HOME/.Isis and must be named IsisPreferences.
+
+An example usage is,
+```
+Group = UserInterface
+ ProgressBarPercent = 1
+EndGroup
+```
+
+### Project Preference File
+
+Finally the highest priority preference file is a project file. It is specified on the command line when executing ISIS applications. For example,
+
+`highpass -pref=/bigProject/Preferences`
+
+## User Interface
+
+The preference file's user interface group enables customization of how applications run and their graphical appearance. In both graphical and command line modes, users receive a progress indicator. The progress bar's increment can be tailored to increase by 1%, 2%, 5%, or 10%. Additionally, in command line mode, users can opt to disable the progress bar. GUI style options include Windows and Fusion. Users can specify the browser launched from the GUI, as well as the GUI's font type and size. By default, all history files are stored in the user's home directory under .Isis/history, but this can be customized to save files in the current directory (using '.') or any other directory. Users can also disable history recording if they prefer not to record program history.
+
+```
+Group=UserInterface
+ ProgressBarPercent = 1 | 2 | 5 | 10
+ ProgressBar = On | Off
+ GuiStyle = windows | fusion
+ GuiHelpBrowser = firefox { your preferred browser, may need path }
+ GuiFontName = helvitica | times | charter | any legal font
+ GuiFontSize = 10 | 12 | 14 | any font point size
+ HistoryPath = $HOME/.Isis/history { your preferred location for the application .par files }
+ HistoryRecording = On | Off
+ HistoryLength = your preferred count of history entries to remember
+EndGroup
+```
+
+### GuiStyle Examples
+
+| Default | Windows | Fusion |
+| -------- | ------- | ------ |
+| [![[jigsaw default style GUI Screenshot]](../../assets/isis-fundamentals/default-style.png)](../../assets/isis-fundamentals/default-style.png) | [![[jigsaw windows style GUI Screenshot]](../../assets/isis-fundamentals/windows-style.png)](../../assets/isis-fundamentals/windows-style.png) | [![[jigsaw fusion style GUI Screenshot]](../../assets/isis-fundamentals/fusion-style.png)](../../assets/isis-fundamentals/fusion-style.png) |
+
+## Error Facility
+
+Errors can be written in either standard (single line) or PVL format, with the option to suppress the source file and line number identifying where the error occurred. Additionally, stack traces can be displayed when running ISIS in debug mode.
+
+```
+Group = ErrorFacility
+ Format = Standard | Pvl
+ FileLine = On | Off
+ StackTrace = On | Off
+EndGroup
+```
+
+## ShapeModel
+
+These parameters govern the selection of the ray-tracing engine for handling shape models. To utilize the ISIS default, either omit or comment out the ShapeModel group. The tolerance, measured in kilometers, is used to assess the visibility or occlusion of a point.
+
+```
+Group = ShapeModel
+ RayTraceEngine = Bullet | Embree
+ OnError = Continue | Fail
+ Tolerance = { numerical value that will be set as the
+ tolerance for the Bullet or Embree shape
+ model }
+EndGroup
+```
+
+## Session Log
+
+These parameters govern the session log, allowing for complete logging cessation, directing logs to a terminal, a file, or both. The log file's name is customizable, and its content can either overwrite existing data or be appended to it.
+
+```
+TerminalOutput = On | Off
+FileOutput = On | Off
+FileName = print.prt | /mydirectory/myfile.prt
+FileAccess = Append | Overwrite
+```
+
+| TerminalOutput | |
+| --- | --- |
+| On - in command-line mode | User input parameters, results, and accounting are reported to the terminal. Errors are reported in Pvl format, also to the terminal. |
+| On - in interactive mode | Similar to command-line mode, but the output is directed to the GUI. In the event of an error, nothing is reported to the GUI except a pop-up window displaying the error. |
+| Off - in command-line mode | Only the results are reported to the terminal. In the case of an error, the error is reported in PVL format to the terminal. |
+| Off - in interactive mode | Similar to command-line mode, but errors are reported in a pop-up window in the GUI. |
+
+
+## Cube Customization
+
+Users have control over the specific attributes of cube I/O operations. They can determine whether programs will:
+
+1. Automatically overwrite an existing cube or issue an error message.
+2. Generate a single attached file containing labels, history, and cube data, or create a detached cube with three separate files (label, history, data).
+3. Record a history entry of the program in the cube file.
+4. Define the maximum size of the cube in gigabytes.
+
+```
+Group = CubeCustomization
+ Overwrite = Allow | Error
+ Format = Attached | Detached
+ History = On | Off
+ MaximumSize = max # of gigabytes
+EndGroup
+```
+
+## File Customization
+Users can configure whether non-cube files can be overwritten or if an error should be triggered instead.
+
+```
+Group = FileCustomization
+ Overwrite = Error | Allow
+EndGroup
+```
+
+## Performance
+
+Users have the option to tailor how ISIS utilizes the resources of their computer.
+
+```
+Group = Performance
+ CubeWriteThread = Always | Optimized | Never
+ GlobalThreads = Optimized | N
+EndGroup
+```
+
+| CubeWriteThread| |
+|---|---|
+|Always | Override ISIS program defaults and consistently utilize a separate thread for writing out cubes. While this change may enhance performance for certain programs, it could potentially have a negative impact on programs that read and write the same file. This option should be approached with caution. |
+| Optimized | Allow the ISIS program to make decisions based on its own internal knowledge. |
+| Never | Revert to the original method of writing cubes. |
+
+| GlobalThreads| |
+|---|---|
+| Optimized | The number of global (active processing) threads utilized will align with the current system's CPU core count. |
+| N | Global (processing threads) handle the majority of CPU-intensive operations in ISIS. This value should be a positive whole number greater than 0. Note that this number doesn't affect the count of other thread types in ISIS, such as the cube write thread, but it should provide a reasonable estimate of overall CPU usage potential in ISIS. |
+
+## Plugins
+Users can specify the locations where ISIS should search for Community Sensor Model (CSM) plugins. The value of this keyword should be a list of paths containing CSM plugin libraries.
+
+For developers, see [Adding USGSCSM Plugin to ISIS](../../how-to-guides/environment-setup-and-maintenance/adding-usgscsm-plugin-to-isis.md#for-developers) for setting up USGSCSM plugins in ISIS Preferences.
+
+```
+Group = Plugins
+ CSMDirectory = ("$ISISROOT/lib/csmplugins/", -
+ "$ISISROOT/lib/isis/csm3.0.3/", -
+ "$ISISROOT/csmlibs/3.0.3/", -
+ "$HOME/.Isis/csm3.0.3/")
+EndGroup
+```
+
+## Data Directories
+
+ISIS supports numerous missions that necessitate various data, such as SPICE kernels or calibration files. Given that these files can be substantial in size, it may be necessary to relocate the data to different directories from the standard distribution. This customization facilitates meeting that requirement. Typically, the ISIS system manager would adjust this group in the system-wide preference file.
+
+```
+Group = DataDirectory
+ Apollo15 = $ISISDATA/apollo15
+ Apollo16 = $ISISDATA/apollo16
+ Apollo17 = $ISISDATA/apollo17
+ Base = $ISISDATA/base
+ Cassini = $ISISDATA/cassini
+ Chan1 = $ISISDATA/chan1
+ Chandrayaan1 = $ISISDATA/chandrayaan1
+ Clementine1 = $ISISDATA/clementine1
+ Clipper = $ISISDATA/../datalocal/clipper
+ Control = $ISISDATA/control
+ Dawn = $ISISDATA/dawn
+ Galileo = $ISISDATA/galileo
+ Hayabusa = $ISISDATA/hayabusa
+ Hayabusa2 = $ISISDATA/hayabusa2
+ Juno = $ISISDATA/juno
+ Kaguya = $ISISDATA/kaguya
+ Lo = $ISISDATA/lo
+ Lro = $ISISDATA/lro
+ Mariner10 = $ISISDATA/mariner10
+ Mer = $ISISDATA/mer
+ Mex = $ISISDATA/mex
+ Messenger = $ISISDATA/messenger
+ Mgs = $ISISDATA/mgs
+ Mro = $ISISDATA/mro
+ Near = $ISISDATA/near
+ NewHorizons = $ISISDATA/newhorizons
+ Odyssey = $ISISDATA/odyssey
+ OsirisRex = $ISISDATA/osirisrex
+ Rolo = $ISISDATA/rolo
+ Rosetta = $ISISDATA/rosetta
+ Smart1 = $ISISDATA/smart1
+ Tgo = $ISISDATA/tgo
+ Viking1 = $ISISDATA/viking1
+ Viking2 = $ISISDATA/viking2
+ Voyager1 = $ISISDATA/voyager1
+ Voyager2 = $ISISDATA/voyager2
+ Temporary = .
+EndGroup
+```
+
diff --git a/mkdocs.yml b/mkdocs.yml
index 60485bb2b3025e9d1fb2c07b7a091013cc54eb3e..bbbc7e956fa358b980cb85ebb7fb46ed7c26bb22 100644
--- a/mkdocs.yml
+++ b/mkdocs.yml
@@ -89,6 +89,7 @@ nav:
- Bit Types: concepts/isis-fundamentals/bit-types.md
- Special Pixels: concepts/isis-fundamentals/special-pixels.md
- Command Line Usage: concepts/isis-fundamentals/command-line-usage.md
+ - Preference Dictionary: concepts/isis-fundamentals/preference-dictionary.md
- SPICE:
- SPICE Overview: concepts/spice/spice-overview.md
- SPICE Position Functions and Requirements: concepts/spice/spice-position-functions-and-requirements.md