In this scenario the master data register collaborates with the various data producing application functions. This means that when data is modified in one of the systems these modifications are shared between all collaborating functions. Therefore the integration between these data producers is essential in this scenario
An interesting scenario in this is where the Data Register is only used as a key store or key cabinet and the detailed data is kept in the other source systems

Advantages
- Data is gathered directly from source systems and thus it is always accurate and real time.
- Data can be stored within the source systems in a specific format supporting the business processes within these systems
- Differences in availability between consumers and sources can be handled by the Data Register
- Reuse of screens, workflows and validations in the source systems
- Data standardization within the Data Register
- Introduction of a key store or key cabinet.

Disadvantages
- Managing the synchronization between systems is an extra piece of work and complexity.
- Replication of data
- Complex data transformations from sources to register and back