> For the complete documentation index, see [llms.txt](https://monasheng.gitbook.io/zerotohero/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://monasheng.gitbook.io/zerotohero/cots-parts-zero-to-hero/cots-principles.md).

# COTS Principles

- [Product Development Life Cycle](https://monasheng.gitbook.io/zerotohero/cots-parts-zero-to-hero/cots-principles/product-development-life-cycle.md)
- [Project Risk](https://monasheng.gitbook.io/zerotohero/cots-parts-zero-to-hero/cots-principles/project-risk.md)
- [Fast/Good/Cheap](https://monasheng.gitbook.io/zerotohero/cots-parts-zero-to-hero/cots-principles/fast-good-cheap.md)
- [Specification and Integration](https://monasheng.gitbook.io/zerotohero/cots-parts-zero-to-hero/cots-principles/specification-and-integration.md)