# Value History

With CloudTruth you can view historical changes to configuration parameter values for your [projects ](/configuration-management/projects.md)and [environments](/configuration-management/environments.md). This allows you to audit and rollback configuration changes that may not have been effective or caused unintended behaviors in your application.

## Retrieving previous parameter value versions

You can access the history page from your selected project by clicking `History`. The history screen displays the selected environment and the current parameter values for that environment.

![](/files/-MlGyTYHso1AAVoTJmbf)

### History by Tag

You can select an [environment tag](/configuration-management/environments.md#tagging) to compare the current projects parameters to and click Apply.

![](/files/-MlGyTdHDZOHSY84PJ55)

The table now displays values for your project parameters for the current time compared to the parameter values at the selected tag.

![](/files/-MlGyTjqJT-jscb_qBzF)

You can rollback current values directly from the history page with the edit operation![](/files/-Mi8Pw8j1tR-gbewtRX0)for each individual value.

### History by date

You can now select a date and approximate time to compare the current projects parameters to\*\*.\*\*

![](/files/-MlGyTdLxSXY1JC8zKeZ)

The table now displays values for your project parameters for the current time compared to the parameter values at a previous point in time.

If you discover a value that is not quite right, you can modify current values directly from the history page with the edit operation![](/files/-Mi8Pw8j1tR-gbewtRX0)for each individual value.

![](/files/-MlGyTdK0w2n6zf_40qW)

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