Certain important sectors of our economy are visibly under-managed due mainly to lack of professionalism and therefore, the clear remedy is to provide advanced management and business training to key groups of managers and employees in those sectors, said the Minister of Petroleum Industries Susil Premajayantha. He made those observations while addressing a group of professionals, academics and businessmen at the World Trade Center where the Minister declared-open the training compound of the Graduate School of Management (GSM) recently.