So, case studies, as in how to...

I've done one case study, last year. I googled how to and came up what seems to be some common headings (Abbreviations, Concept, Background, Focus, Scope, Introduction, Analysis, Recommendations, Conclusions, References)

My question, do I have to use most of them, or can I use completely other headings that more specifically relate to my topic? Do uni ones have to be a certain style?