Prompted by a ruling over a death from overwork, Toyota Motor Corp. will pay full overtime to factory workers engaged in after-hour kaizen (or continuous improvement) activities designed to improve efficiency and product quality, sources said. Japan's top automaker now pays compensation only for up to two extra hours a month because it considers employees are engaged voluntarily in kaizen activities. But the company decided Wednesday to regard kaizen as part of the workers' job requirements and start paying allowances on June 1 to cover all work done after hours, the sources said. Labor unions at the company have agreed to the revision.