# SequentialChain

> **Class** in `langchain_classic`

📖 [View in docs](https://reference.langchain.com/python/langchain-classic/chains/sequential/SequentialChain)

Chain where the outputs of one chain feed directly into next.

## Signature

```python
SequentialChain()
```

## Extends

- `Chain`

## Properties

- `chains`
- `input_variables`
- `output_variables`
- `return_all`
- `model_config`
- `input_keys`
- `output_keys`

## Methods

- [`validate_chains()`](https://reference.langchain.com/python/langchain-classic/chains/sequential/SequentialChain/validate_chains)

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/02991cb4cf2063d51a07268edafb05fe53de1826/libs/langchain/langchain_classic/chains/sequential.py#L16)