Sal is a wonderful employee, who has a long history with the organization, and can usually be counted on to get his work done on time. Paul, his supervisor, has noticed that Sal has demonstrated some attitude problems over the past several months accompanied by a diminished work output. Paul has given Sal some oral warnings about his behavior to no avail. Paul does not wish to further discipline Sal, but knows that something needs to be done. What other alternative is available for Paul to use?