Repetition

Same task over a list, one by one (sequential multi‑instance)

Note: Related configuration: read Multi‑instance execution for collection, item alias, and aggregation.

Use when

• Tasks must occur in order.
• Each step depends on a prior result.
• Sequence integrity matters.

Pattern in simple words

1. Start.
2. Service task with sequential multi‑instance: Reconcile transaction over the collection.
3. End All reconciled.
   Note: Sequential mode preserves order.

Other scenarios

• Finance: Post invoice lines in sequence.
• Insurance: Review claims in received order.
• Healthcare: Process test results per patient.
• Retail: Approve store returns sequentially.
• Manufacturing: Inspect items per batch.

Same task over a list, all at once (parallel multi‑instance)

Use when

• Items are independent.
• Items are independent
• Order does not affect outcome.

Pattern in simple words

1. Start.
2. Service task with parallel multi‑instance: Run security scan for each server in the collection.
3. User task: Review results.
4. End Scan complete.

Note: Use aggregation to collect per‑item outputs.

Other scenarios

• Finance: Client credit checks simultaneously.
• Insurance: Evaluate multiple policies in parallel.
• Manufacturing: Inspect multiple lines concurrently.
• Retail: Update store prices at once.
• Public sector: Review permits across districts together.

Nested repetition inside a subprocess

Use when

• Two levels of iteration exist, such as batch and item.
• You need a clean structure that keeps loops organized.

Pattern in simple words

1. Start.

2. Subprocess with sequential multi‑instance: Inspect batch, one batch at a time.

   • Inside the subprocess: Service task with parallel multi‑instance: Inspect item for each item in the batch.

3. End Batch complete.

Note: Use sequential outer and parallel inner when batches must not overlap.

Other scenarios

• Finance: Process monthly statements with multiple entries.
• Healthcare: Audit patients by department.
• Retail: Reconcile store sales by region.
• Manufacturing: Audit batches by product line.
• Insurance: Review claims by policy group.