Comprehensive ERP/HCM System Diagramming

My ERP & HCM implementation has reached the design phase and I now need a full set of analytical diagrams to lock down requirements before development begins.

The data-flow diagram must capture every major process, datastore, external entity and the data that moves between them, giving a clear, end-to-end picture of how information circulates through the entire platform.

For the Use Case diagram I want all core functionalities mapped against the corresponding user or role so responsibilities and permissions are crystal-clear at a glance.

Beyond those two, I also want:
• an ERD that lays out entities, attributes and relationships in a way that supports both the ERP modules and the HCM components, and
• sequence diagrams showing the most critical interaction flows, especially where cross-module processes occur.

Please work in standard UML (or BPMN where appropriate) and deliver both high-resolution PDFs for quick review and the editable source files (Visio, Lucidchart, or a comparable tool) so the team can iterate later. Accuracy, consistency of notation and tidy, readable layouts will be the key acceptance criteria.

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