How do you write a detailed rationale?

Answer 1

Just use sane, sensible reasoning.

Answer 2

To write a detailed rationale we first have to:
-write and present your paper in APA style (Intro/Body/Conclusion/Referencing) or whichever style permitted
-Analyse the question (break it down/what does each part mean/research each)
-Do further readings (Reference everything to give integrity to your answer & to justify the rationale)
-Ensure you "explain" how you came up with your answers (this shows your method)
-Detail comes from when everything is complete.