I agree, Hyla, these sound wanky! (Coming from me, working in a Bank... tee hee!)

"Background and Diagnosis"

I would probably use something like "Background and Identification (of the issues)" or "Preliminary research".

"Prognosis."

I guess this depends on what kind of information is in the section thus entitled. In documents I've produced this would be called something like "Implementation" or "Projection".

Hope that helps!