An internal memo sent to Wal-Mart's board of directors proposes numerous ways to hold down spending on health care and other benefits while seeking to minimize damage to the retailer's reputation. Among the recommendations are hiring more part-time workers and discouraging unhealthy people from working at Wal-Mart...In an interview, Ms. Chambers [Wal-Mart's executive vice president for benefits] said she was focusing not on cutting costs, but on serving employees better by giving them more choices on their benefits.