---
title: "See what changed and check the evidence."
description: "HARBINGER compares approved sources to find new records, corrections, withdrawals, and changed relationships. Each change stays linked to its evidence, conflicting signals, and open questions."
updated: "31 August 2026"
candidate_route: "/docs/harbinger/overview"
---

# See what changed and check the evidence.

HARBINGER compares approved sources to find new records, corrections, withdrawals, and changed relationships. Each change stays linked to its evidence, conflicting signals, and open questions.

## The shipment still looks normal. Supplier lead time is up 17 days.

Read the conflicting signals in one view and see why the case warrants review. No account or customer data is required.

**SYNTHETIC SUPPLY-CHAIN EARLY WARNING:** SYNTHETIC · PUBLIC EXAMPLE

### Situation

READ THE NORMAL AND RISK SIGNALS TOGETHER

- **Supplier lead time:** 14 → 31 days — Standard lead-time notice
- **Related signal:** Port delay bulletin — Added dwell time on the same route
- **Current report:** Shipment schedule normal — No reported delay yet

### Review

SEPARATE WHAT CHANGED FROM WHAT REMAINS UNKNOWN

- **Change candidate:** Delivery risk warrants review
- **Counter-signal:** The shipment schedule still reports normal
- **Open gap:** Inventory impact remains unconfirmed

### Next question

RAISE A REVIEW QUESTION, NOT A CONCLUSION

- **Output:** Review candidate — change · evidence · counter-signal · unknown
- **Review question:** Should the team open an alternate-supply review before inventory risk is confirmed?
- **Authority:** NONE — No fact determination, recommendation, or execution

> **Product boundary:** Review candidate only — Observation does not become a fact or action command.

- [Follow this signal end to end](/golden-thread) — HARBINGER → PÓLYA → RAIFFA → verification record
- [Quickstart](/docs/harbinger/getting-started)
- [API reference](/docs/api/overview)

## Detect updates, corrections, withdrawals, and conflicts

HARBINGER compares records across approved sources. Reviewers begin with what changed and the evidence that warrants attention instead of rereading every source from the start.

> **Review boundary:** A surfaced change is a review candidate, not a fact determination. Keep the original source, time, conflict, and unresolved gap in view.

## Move from observation to the next inquiry

1. **Set the scope** — Name the object, time window, permitted sources, and stopping rule.
2. **Read the change** — Compare supported states without erasing corrections or late-arriving evidence.
3. **Trace evidence and impact** — Follow bounded relationships while keeping counter-signals in view.
4. **Choose the next inquiry** — Record the smallest evidence path that could materially change the current view.

## Observation is not authority

HARBINGER output is material for human review. It is not a recommendation, approval, command, or execution instruction.

> **Boundary:** HARBINGER may reveal a path worth checking. It does not decide whether anyone should act.

---

Published route: /docs/harbinger/overview