Although questions of productivity may be of most interest to upper management, most employees are interested in the daily life of the workplace. Office politics marks an inescapable and sometimes very difficult part of such day-to-day work life. In their 1998 review, Erik Andriessen and Pieter Drenth discuss the multiple parties model, which came of age in the 1970s and was influenced by a Marxist theory of management-worker relations. This approach emphasizes the competition for power that often goes on within an organization.