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A week of voting in the referendum in South Sudan has begun but if the people do opt for independence what will happen to the country's most valuable resource, its oil? A year of negotiations has failed to reach any settlement. Justin Rowlatt interviews Roger Middleton of Chatham House's Africa Programme about how oil revenues might be divided because the oil may be in the South but the refinery and the pipelines are in the North. And, how Helmuth von Moltke the elder's reorganisation of the Prussian Army in the mid 1800s can improve your management skills. Plus, social media has made it much easier for consumers express their views on how companies operate - look what happened when the cloting retailer Gap tried to change its logo. Lucy Kellaway of the Financial Times asks how management can assert its right to manage in the face of this online cacophony.