# 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/9.3-data-integration/data-integration-perspective-in-the-pdi-client/advanced-topics-pdi-perspective/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/9.3-data-integration/data-integration-perspective-in-the-pdi-client/advanced-topics-pdi-perspective/pdi-run-modifiers/arguments.md): Set argument values passed to your transformation through the Arguments dialog box. |
| [Variables](/pdia-data-integration/9.3-data-integration/data-integration-perspective-in-the-pdi-client/advanced-topics-pdi-perspective/pdi-run-modifiers/variables.md) | Set values for user-defined and environment variables pertaining to your transformation during runtime.                                                                                                                                                                                                                                                                                                                                                                                |


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.pentaho.com/pdia-data-integration/9.3-data-integration/data-integration-perspective-in-the-pdi-client/work-with-transformations-cp/run-your-transformation/parameters-and-variables.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.