Energy and Oil & Gas companies face procurement challenges like no other. Their size alone—often incorporating tens of thousands of employees across dozens of countries—makes managing supply chains a complex and crucial undertaking. Oil & Gas company diversification across business activities— exploration and research, production, management of alternative energy sources, operating gas stations and retail outlets— means managing spend across even the most mission-critical categories is a major challenge. And every function can seem mission-critical in its own way: from the selection of billion-dollar pieces of heavy machinery to the receipt rolls in a gas station cash register.