Economic expansion and technological change are increasing the demand for skilled workers. Much of our education and workforce development policy focuses on the skills people acquire before they start working. But it is also important for workers to continue their training once they are on the job in order to perform company-specific tasks, keep pace with new technology and become more productive employees. This report describes how several major employers are partnering with community colleges to provide training that upgrades the skills of their workers. The report offers key lessons for both employers and community colleges about how to structure their relationships, and about what these very different entities can and should expect from each other.