# SimpleSequentialChain

> **Class** in `langchain_classic`

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

Simple chain where the outputs of one step feed directly into next.

## Signature

```python
SimpleSequentialChain()
```

## Extends

- `Chain`

## Properties

- `chains`
- `strip_outputs`
- `input_key`
- `output_key`
- `model_config`
- `input_keys`
- `output_keys`

## Methods

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

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[View source on GitHub](https://github.com/langchain-ai/langchain/blob/f0c5a28fa05adcda89aebcb449d897245ab21fa4/libs/langchain/langchain_classic/chains/sequential.py#L123)