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0001 # Workflow Notes
0002
0003 See the [workflow guide](../workflows.md) for jobs, objective plans, and ePIC setup.
0004
0005 ## Objective Models
0006
0007 | Class | Purpose |
0008 | --- | --- |
0009 | `ObjectiveDefinition` | Objective name, direction, optional plan, and output `metrics_keys`. |
0010 | `ObjectivePlanSpec` | A `steps` specification containing one or more script or inline stages. |
0011 | `CombinedObjectivePlan` | One plan with multiple metric definitions. |
0012 | `CombinedObjectiveMetric` | Metric name, direction, and `metric_key` to extract from the plan output. |
0013
0014 ## Stack Registration and Geometry Preparation
0015
0016 `StackRegistry` maps a stack name to its environment, design, problem, workflow, and execution classes.
0017
0018 Before branches execute, `DAGExecutor` calls `prepare_workflow_geometry()` once for a workflow with a `stack_type`, design configuration, and problem configuration.
