Well, that's quite a long topic, but in a nutshell :
South Africa cannot continue as a consumption economy, which a strong Rand supports. The effects will build to a catastrophic result. (Our twin peaks are already of major concern)
A weaker Rand (Both Dollar and Euro) and greater stability is needed to become an exporting economy. And it needs to become weaker much faster than would naturally happen with interest rate differentials
EDIT : Overly simplistic article in today's Business Day, but it it touches on it -
http://www.bdlive.co.za/opinion/columnists/2015/03/23/straight-talk-pass-create-the-gaps-and-score
As I mentioned last time you asked, if you are interested in the effects of monetary policy and forex on economic structure, there are lot of resources available online. Alternatively you can pop into some of the lecture halls in the town where you live