“Documentation needs to include and be structured around its four different functions: tutorials, how-to guides, explanation and technical reference. Each of them requires a distinct mode of writing. People working with software need these four different kinds of documentation at different times, in different circumstances – so software usually needs them all.
And documentation needs to be explicitly structured around them, and they all must be kept separate and distinct from each other.”
—Daniele Procida, “What nobody tells you about documentation.” Divio. Accessed: November 12, 2018.
Probably applicable to any kind of documentation process you need to replicate, not just for software.