# Compare the Two Readings

> A technique for enforcing a change rule by comparing the content before and after the change.

Record: `lexicon:compare-the-two-readings`
Kind: technique
Layer: [Execution Core](https://banes-lab.com/records/layer/execution-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-compare-the-two-readings

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Retain the Prior State in the Spanning Layer](https://banes-lab.com/records/lexicon/retain-the-prior-state-in-the-spanning-layer.md) and before [Type the Carrier](https://banes-lab.com/records/lexicon/type-the-carrier.md).

## Category

- [Coordination Surfaces](https://banes-lab.com/records/lexicon-category/coordination-surfaces.md)

## Refactors

- [State-Arity Limit](https://banes-lab.com/records/architecture/state-arity-limit.md)

## Linked from

- [Coordination Surfaces](https://banes-lab.com/ontology/principles/architecture-category-coordination-surfaces.md)