# Cross-cutting concerns on every layer

- [Safety & Alignment](https://justuju.org/concern/safety/): Making models and agents behave as intended and avoid harm, from training data to deployed apps.
- [Evaluation](https://justuju.org/concern/evaluation/): Measuring what systems can do and how reliably, at every layer: benchmarks, red-teaming, production monitoring.
- [Cost & Economics](https://justuju.org/concern/cost/): Energy, chips, training runs and per-token prices: cost shapes decisions at every layer.
- [Governance & Regulation](https://justuju.org/concern/governance/): Laws, standards, licences and export controls that constrain what can be built and deployed.
- [Security](https://justuju.org/concern/security/): Protecting every layer from attack: supply chain, infrastructure, model files, prompt injection and agent permissions.

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