The full handbook is at <a href="https://www.nasa.gov/reference/systems-engineering-handbook/" rel="nofollow noreferrer">https://www.nasa.gov/reference/systems-engineering-handbook/</a><p>I was looking for inspiration on requirements engineering practices beyond arc42 & friends that are compatible with (or can be explained to deciders in) larger organisations, and found the Nasa process ideas (expectations - "conops" - requirements) surprisingly flexible