1 # Development {#ch-development}
3 This chapter describes how you can modify and extend NixOS.
5 ```{=include=} chapters
7 writing-modules.chapter.md
8 building-parts.chapter.md
10 what-happens-during-a-system-switch.chapter.md
11 writing-documentation.chapter.md
12 nixos-tests.chapter.md
13 developing-the-test-driver.chapter.md
14 testing-installer.chapter.md