# Where did this number come from?

Prompt · Data integrity and analytics · D02

Checks that every number on screen can be traced back to a source document.

## Prompt

```text
Trace every derived metric to its raw evidence, transformation logic, assumptions, and historical version. Find calculations that cannot be independently reproduced.
```

**What it returns:** For each metric: raw inputs, formula with file:line, and an independent recomputation for one real record.

**Skip it when:** Numbers shown exactly as stored, with no math applied.

**Tools:** Repository, read-only database, the source filings.

**Changes:** Changes nothing

**Sessions:** Look first, then fix in a new session

## Related

- [Missing vs zero vs stale](https://www.atlasscope.dev/prompts/missing-vs-zero-vs-stale): Finds where 'we don't know' turns into 0 and then into a wrong total.
- [Old records, new meanings](https://www.atlasscope.dev/prompts/old-records-new-meanings): Finds old records that read differently once today's rules are applied to them.
- [Rounding and unit mix-ups](https://www.atlasscope.dev/prompts/rounding-and-unit-mix-ups): Finds money and percentage values that change scale or lose precision along the way.
- [Can we independently prove these numbers?](https://www.atlasscope.dev/prompts/can-we-independently-prove-these-numbers): Important figures may be wrong even though their lineage is documented.

Source: https://www.atlasscope.dev/prompts/where-did-this-number-come-from