# Forward-Only State Model

> The requirement that processing keep only forward-moving state, never needing to revisit earlier input.

Record: `lexicon:forward-only-state-model`
Kind: constraint
Layer: [Execution Core](https://banes-lab.com/records/layer/execution-core.md)
Canonical: https://banes-lab.com/ontology/lexicon#lexicon-forward-only-state-model

Listed in [Lexicon terms](https://banes-lab.com/api/records/lexicon.md), after [Ordering/State](https://banes-lab.com/records/lexicon/ordering-state.md) and before [Global Optimization](https://banes-lab.com/records/lexicon/global-optimization.md).

## Category

- [Streaming / Pipeline / Dataflow Processing](https://banes-lab.com/records/lexicon-category/streaming-pipeline-dataflow-processing.md)

## Required by

- [Single-Pass Processing](https://banes-lab.com/records/architecture/single-pass-processing.md)

## Linked from

- [Streaming / Pipeline / Dataflow Processing](https://banes-lab.com/ontology/principles/architecture-category-streaming-pipeline-dataflow-processing.md)