# Defining the Data Viewer custom review states

Custom review states for the Data Viewer can be defined in two ways:

- During study design in the Central Designer application—For more information, see the Central Designer InForm Design Guide.
- With MedML in the InForm application—The system administrator can install MedML that contains the definitions for up to five custom review states. For more information, see the Utilities Guide.

Custom review states:

- Can be defined at different times, but each state (including its three stages) must be completely defined at one time. An administrator cannot partially define custom review states.
- Must be fully defined before they are available for use by any reviewer.
- If defined in the Central Designer application, can be updated (added, modified, or deleted) using MedML in the InForm application.

Note: Custom review states cannot be defined using the InForm user interface.

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