# Diagnostic Case: diag-02

Subset modifier — 'some customers' means not universal. Should distinguish from blanket claims.

## Input

```
Some customers reported that the new app crashes when uploading photos.
```

## Result

- **Technical**: ✅ PASS (1/4 sub-checks pass)
- **Reasoning Quality**: ❌ FAIL (0/2 sub-checks pass)
- **Actual Primary Type**: observed_problem
- **Actual Reasoning Modes**: identify_difference
- **Response Duration**: 2ms

### Reasoning Quality Failures

missing required concept(s): app crashes, photo upload, some customers