---
title: rationale
framework: evaluations
role: symbol
role_heading: Instance Property
path: evaluations/metric/rationale
---

# rationale

An optional rationale describing the result.

## Declaration

```swift
let rationale: String?
```

## See Also

### Inspecting a result

- [name](evaluations/metric/name.md)
- [value](evaluations/metric/value-swift.property.md)
- [doubleValue](evaluations/metric/doublevalue.md)
- [Metric.Value](evaluations/metric/value-swift.enum.md)