graph TD;
            A[Import Carrier Shipments]:::user-action --> B(Analyze Shipment Data):::system-action;
            B --> C[View Analysis of Shipment Data]:::user-action;
            C --> D(Recommend Optimizations):::system-action;
            D --> E[Take Action on Recommendations]:::user-action;
      
            classDef user-action fill:#f0f8ff,stroke:#333,stroke-width:2px;
            classDef system-action fill:#f5f5f5,stroke:#333,stroke-width:2px;