# Recommended Steps

You can use the recommended steps to install the Substation ES IMS interface.

- An IMS systems programmer performs the installation and makes the necessary changes to the IMS exit routines.
- If messages are to be rerouted from IMS to Substation ES IMS Interface through OTMA, perform the steps in Installing OTMA Message Routing.
- Include the load module of an installed or changed exit routine in an authorized library in the `JOBLIB`, `STEPLIB`, or `LINKLIST` library concatenated in front of `IMS.SDFSRESL`.
- If you change or install the IMS exit routines, recycle the IMS control region.

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