Good planning, and not super high technology is the key to fighting tanker oil spills, Ian White, managing director of London-based International Tanker Owners Pollution Federation Ltd. said last week. "There are technological limitations as to what you can do (to control oil spills). He said in a speech most spills from tankers occurred during routine operations such as loading, discharging and bunkering. But bigger spills involving more than 700 tons have resulted from collisions and groundings, he said. "You can use booms and skimmers to concentrate the oil, pick it up and remove it, but it tends to be quite inefficient, especially if the weather is not good," White said.