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# Assess Change Impact

This task describes how to test the impact that changes in the data model have on simulation.

In this topic:

## Open the Simulation Preview pane

In the Data Model Editor, select View Options > Simulation Preview. For user interface details, see Simulation Preview Pane.

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## Preview a simulated response

1. Open Simulation Preview.
2. Select a row in a data rule. The simulated response is displayed.
3. Edit the request data to view the impact on the response.

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## Test the impact of a change on the simulation

1. Open Simulation Preview.
2. Select a row in a data rule.
3. Click to pin the row to Simulation Preview.
4. Select an existing row in a data rule, or create a custom rule with a higher priority to view the impact on the simulation.
5. View the impact on the message response in the pinned row in Simulation Preview.

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## Troubleshoot

If you have a message request that is not matching any rule in your data model, you can compare it to rows in the data rules to look for a problem in your rule definitions.

1. Open Simulation Preview.

2. Do one of the following:

   1. Select an existing row in a data rule.
   2. Right-click in Simulation Preview and select Import Request.
3. Click to pin the row to Simulation Preview.
4. Select another row in a data rule to compare the two rows.

5. Click Show Differences to highlight the differences in the Data Model Editor table.

   Note: The columns displayed in the Data Model Editor table may change when you are comparing rows. To restore the display the previously defined column settings, click Restore Columns.

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See also:

- Simulation Preview

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