# Reproduce, measure, prove

Thinking prompt · Thinking prompts · M08

Use it in the second session, after a read-only investigation found a real problem.

## Prompt

```text
Before repairing a suspected defect or performance problem, establish a reproducible failing case or measurable baseline. Find the root cause, implement the narrowest defensible fix, rerun an independent check, and report the before/after evidence. If you can't measure or reproduce it, say what evidence is missing instead of claiming a win.
```

Source: https://www.atlasscope.dev/prompts/reproduce-measure-prove