Orchestration = Stages → Steps → Background Automations

Stage 1: "HR Review"
├─ Step 1.1: Interactive Step (HR Manager reviews)
├─ Step 1.2: Background Automation (create records)
└─ Decision: Approved? → Next Stage : End

Stage 2: "IT Provisioning"
├─ Step 2.1: Interactive Step (IT assigns equipment)
├─ Step 2.2: Background Automation (provision accounts)
└─ Step 2.3: Interactive Step (IT confirms completion)

Stage 3: "Manager Onboarding"
├─ Step 3.1: Interactive Step (Manager schedules 1:1)
└─ Step 3.2: Background Automation (send welcome email)

Setup → Flows → New Flow → Orchestration
Name: Employee_Onboarding
Object: Employee__c (custom object)
Trigger: Record Created, Status = 'Pending Onboarding'

Stage Name: HR_Document_Review
Stage Description: HR verifies employee documentation
Run Mode: One at a Time (sequential)

Step 1.1 (Interactive):
- Name: Review_Documents
- Assigned To: Queue "HR_Onboarding_Queue"
- Due Date: 2 days from start
- Screen Flow: HR_Document_Review_Screen
- Inputs: Employee__c.Id

Step 1.2 (Background - Decision):
- If HR_Approved = true → Next Stage
- If HR_Approved = false → End + Send Rejection Email

Stage Name: IT_Provisioning
Condition: Runs only if Stage 1 approved

Step 2.1 (Interactive):
- Name: Assign_Equipment
- Assigned To: Queue "IT_Provisioning_Queue"
- Due Date: 3 days from stage start
- Screen Flow: IT_Equipment_Assignment
- Inputs: Employee__c.Id

Step 2.2 (Background):
- Name: Create_AD_Account
- Autolaunched Flow: Create_Active_Directory_Account
- Inputs: Employee__c.Email, Employee__c.FirstName

Step 2.3 (Background):
- Name: Send_IT_Confirmation
- Action: Send Email Template
- Recipient: Employee__c.Email
- Template: Welcome_Email

Stage Name: Manager_Setup
Depends On: Stage 2 complete

Step 3.1 (Interactive):
- Name: Schedule_First_Day
- Assigned To: Employee__c.Manager__c
- Due Date: 1 day from stage start
- Screen Flow: Manager_Onboarding_Tasks

Step 3.2 (Background):
- Name: Update_Status
- Record Update: Employee__c.Status = 'Onboarding Complete'

If Step 2.2 (Create_AD_Account) fails:
├─ Retry Step (1 attempt after 10 minutes)
├─ If still fails:
│  ├─ Send email to IT Manager with error details
│  ├─ Create Task for manual provisioning
│  └─ Assign Interactive Step to IT Manager for resolution
└─ Continue to Stage 3 (don't block entire process)

Step 2.2: Create_AD_Account
├─ Fault Path Enabled: true
├─ Retry Attempts: 1
├─ Retry Delay: 10 minutes
└─ On Final Failure:
   ├─ Create Task
   │  ├─ Subject: "Manual AD Account Creation Needed"
   │  ├─ Assigned To: IT_Manager_Queue
   │  └─ Priority: High
   └─ Send Email Notification
      ├─ Template: IT_Provisioning_Failure
      └─ Recipients: IT Managers

Interactive Step Configuration:
├─ Screen Flow: Define UI for user input
├─ Assigned To: User, Queue, or Role
├─ Due Date: Formula (TODAY() + 2 for 2 days)
├─ Instructions: What user should do
├─ Input Variables: Data passed to screen flow
└─ Output Variables: Data returned from user

Screen: Review Documents
├─ Display: Employee Name, Position, Documents Uploaded
├─ Input: Radio Button (Approve / Reject)
├─ Input: Text Area (Comments - required if reject)
└─ Action: Save & Submit

Output Variables:
- HR_Approved (Boolean)
- HR_Comments (Text)

Background Step Types:
├─ Autolaunched Flow: Call another flow
├─ Apex Action: Invoke Apex method
├─ Send Email: Email template or custom
├─ Post to Chatter: Notify users
├─ Create Records: DML operations
├─ Update Records: Field updates
├─ External Service: REST callout
└─ Wait: Pause for duration or until condition

Stage 2: Manager Approval
├─ Step 2.1 (Interactive): Manager reviews
│  └─ Screen Flow with Approve/Reject buttons
├─ Background Automation: Update approval status
└─ If Approved: Proceed to Stage 3
   If Rejected: Send rejection email, End orchestration

trigger OrchestrationStageTrigger on FlowOrchestrationStageInstance (after insert, after update) {
    List<OrchestrationStageEvent__e> events = new List<OrchestrationStageEvent__e>();

    for (FlowOrchestrationStageInstance stage : Trigger.new) {
        if (stage.Status == 'Completed') {
            events.add(new OrchestrationStageEvent__e(
                OrchestrationId__c = stage.OrchestrationInstanceId,
                StageName__c = stage.StepDefinitionName,
                CompletedDate__c = System.now()
            ));
        }
    }

    if (!events.isEmpty()) {
        EventBus.publish(events);
    }
}

// External system tracks orchestration progress
client.subscribe('/event/OrchestrationStageEvent__e', (message) => {
    const { OrchestrationId__c, StageName__c } = message.data.payload;
    console.log(`Stage ${StageName__c} completed for ${OrchestrationId__c}`);

    // Update external dashboard
    updateOrchestrationStatus(OrchestrationId__c, StageName__c);
});

Stage 2: Document Verification
├─ Step 2.1 (Background): AI agent verifies documents
│  └─ Agentforce Action: Verify_Document_Compliance
│     - Uses Einstein OCR to extract text
│     - Uses LLM to validate against compliance rules
│     - Returns: Compliant (true/false) + Confidence score
├─ Decision: If confidence < 90% → Human review
└─ Step 2.2 (Interactive - Conditional): Human verifies (if AI uncertain)

Causes:
- User not in assigned queue
- User lacks permission to object
- Filter criteria on view excludes item

Solution:
1. Check queue membership: Setup → Queues
2. Verify object permissions: User profile/permission set
3. Review work item list view filters

Causes:
- Apex error in called flow/action
- Required field missing
- Governor limit exceeded

Solution:
1. Enable debug logs: Setup → Debug Logs
2. Check Flow error emails: Setup → Process Automation Settings
3. Implement fault path to catch and handle errors

Causes:
- Trigger criteria not met
- Record not updated properly
- Orchestration inactive

Solution:
1. Verify record meets entry criteria
2. Check orchestration activation status
3. Review audit trail for record updates

// Query orchestration details for debugging
public class OrchestrationDebugger {
    public static void debugOrchestration(Id recordId) {
        // Find orchestration instances for record
        List<FlowOrchestrationInstance> instances = [
            SELECT Id, Label, Status, CreatedDate
            FROM FlowOrchestrationInstance
            WHERE RelatedRecordId = :recordId
            ORDER BY CreatedDate DESC
        ];

        for (FlowOrchestrationInstance instance : instances) {
            System.debug('Orchestration: ' + instance.Label);
            System.debug('Status: ' + instance.Status);

            // Get work items
            List<FlowOrchestrationWorkItem> items = [
                SELECT Id, Label, Status, AssignedToId, DueDate
                FROM FlowOrchestrationWorkItem
                WHERE OrchestrationInstanceId = :instance.Id
                ORDER BY CreatedDate
            ];

            for (FlowOrchestrationWorkItem item : items) {
                System.debug('  Step: ' + item.Label + ', Status: ' + item.Status);
            }
        }
    }
}

Process Builder supports only simple automation
Flow Orchestrator adds:
- Multi-user coordination
- Interactive steps
- Stage-based organization
- Visual progress tracking
- Fault handling

When to migrate:
- Process involves multiple users
- Need stage-based workflow
- Want user interface for steps
- Require better error handling