not sure if i'm the best person to help (this is the little bugger i lost marks for- i think i lost 1 or 2).
in the 2007 question, i think it referred to the recruitment stage, i think i answered something like, developing an attractive remuneration package so the best applicants are attracted to apply to the organisation. whoops.
you are absolutely right, the HR strategies change according to the case study, i think that's the type of question that i didn't practise enough. a mind map sounds like a great idea.
here's something that might help with answering a question like the 2007 one (lol and don't worry, they aren't my notes):

and don't forget- try to link all you strategies to how it
improves productivity, as this is the essence of human resources- to maximise the outputs gained from the inputs (labour/humans)