# Concepts

- [The 4T data model](/5.1/use/concepts/4t_data_model.md): StackState Self-hosted v5.1.x
- [Components](/5.1/use/concepts/components.md): StackState Self-hosted v5.1.x
- [Relations](/5.1/use/concepts/relations.md): StackState Self-hosted v5.1.x
- [Health state](/5.1/use/concepts/health-state.md): StackState Self-hosted v5.1.x
- [Layers, Domains and Environments](/5.1/use/concepts/layers_domains_environments.md): StackState Self-hosted v5.1.x
- [Perspectives](/5.1/use/concepts/perspectives.md): StackState Self-hosted v5.1.x
- [Anomaly detection](/5.1/use/concepts/anomaly-detection.md): StackState Self-hosted v5.1.x
- [StackState architecture](/5.1/use/concepts/stackstate_architecture.md): StackState Self-hosted v5.1.x