> For the complete documentation index, see [llms.txt](https://jamesbrayy.gitbook.io/atar/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jamesbrayy.gitbook.io/atar/engineering/core.md).

# core

- [life cycle and obsolescence](https://jamesbrayy.gitbook.io/atar/engineering/core/life-cycle-and-obsolescence.md)
- [engineering design process](https://jamesbrayy.gitbook.io/atar/engineering/core/engineering-design-process.md)
- [materials](https://jamesbrayy.gitbook.io/atar/engineering/core/materials.md)
- [mechanisms](https://jamesbrayy.gitbook.io/atar/engineering/core/mechanisms.md)
- [types of mechanisms](https://jamesbrayy.gitbook.io/atar/engineering/core/types-of-mechanisms.md)
- [engineering drawings](https://jamesbrayy.gitbook.io/atar/engineering/core/engineering-drawings.md)
- [energy](https://jamesbrayy.gitbook.io/atar/engineering/core/energy.md)