Understanding where data is produced and where it will be used is a starting point for systems integration. Making the relationships between devices, applications and data sources visible helps define the purpose of each connection.
Data format, transfer frequency and update behaviour are considered together. The design identifies where information is stored, how changes are shared and how the same record is interpreted across different systems.
Disconnected services, delayed responses and incomplete records are also part of the workflow. How information is preserved and how work continues under these conditions is planned around the needs of the application.
Building the flow in small steps and observing each connection helps identify where problems arise. Recording interfaces, data fields and decisions supports the continued development and maintenance of the integration.