The Data Models are a pictorial representation of each of the databases. As a customer makes modifications to the physical database they should also make changes to the data model so that they are kept in sync with the physical database.
The ETL process flows are pictorial representations of the activities within an ETL process. As a customer makes modifications to the physical ETL processes they should also make changes to the process flows so that they are kept in sync with the actual ETL process.
The data models and ETL designs are delivered as part of the documentation center. Please refer to the Documentation Center guide for customization guidelines.