> For the complete documentation index, see [llms.txt](https://docs.pentaho.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.pentaho.com/pdia-data-integration/archived-merged-pages/transforming-data-with-pdi-archive/work-with-transformations-cp/run-your-transformation/parameters-and-variables.md).

# Parameters and Variables

You can temporarily modify parameters and variables for each execution of your transformation to experimentally determine their best values. The values you enter into these tables are only used when you run the transformation from the Run Options window. The values you originally defined for these parameters and variables are not permanently changed by the values you specify in these tables.

| Value Type                                                                                                                  | Description                                                                                                                                                                                                                                                                                                                                                                                                                                 |
| --------------------------------------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| [Parameters](/pdia-data-integration/archived-merged-pages/transforming-data-with-pdi-archive/pdi-run-modifiers.md)          | Set parameter values pertaining to your transformation during runtime. A parameter is a local variable. The parameters you define while creating your transformation are shown in the table under the **Parameters** tab.- [Arguments](/pdia-data-integration/archived-merged-pages/transforming-data-with-pdi-archive/pdi-run-modifiers/arguments.md): Set argument values passed to your transformation through the Arguments dialog box. |
| [Variables](/pdia-data-integration/archived-merged-pages/transforming-data-with-pdi-archive/pdi-run-modifiers/variables.md) | Set values for user-defined and environment variables pertaining to your transformation during runtime.                                                                                                                                                                                                                                                                                                                                     |


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