George Wilberson is a qualified engineer and manages a work team that consists of two engineers, four production workers, an accountant, and a purchasing manager. They are about to embark on a new project for their company. George has prepared a memorandum explaining the objectives of the work team. The purchasing manager assigned to this team had already worked with George in the past. However, a difference of opinion had soured their relationship. As a result, the purchasing manager was unable to objectively evaluate and appreciate the various aspects of the current project described in the memorandum. This is an example of ________.