Business case exam questions

I am revising over past papers for LMD people exam and I have noticed a few questions ask for a business case. I have not written a business case yet. Please can someone give me some pointers how to write a business case for an exam question. 

Also, what is the standard length of an exam answer....one/two paragraphs per question, bearing in mind time constraints? 

Some of the questions also ask you to draw upon published research. As the topic is so vast and my memory not so good would I fail the question if I was unable to cite published research? (even though my answer might be acceptable).


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