| T2311 | FATAL ERROR: T2311 | DESIGN OPTIMIZATION OBJECTIVE NOT DEFINED |
| Cause: | A design optimization analysis was performed with no design objective defined. | |
| Action: | Specify a single design objective using the DESOBJ Case Control command and a corresponding DRESP1 Bulk Data entry. | |
| Remarks: | See the Case Control section for command format and the Bulk Data section for entry format. |