Add the following to Figure 3-16: An EMPLOYMENT party relationship is further explained by the positions and assignments to positions during the time a person is employed. A position is defined by an organization unit, and a unit may define many positions over time. Over time, positions are assigned to various employment relationships (i.e., somebody employed by some organization unit is assigned a particular position). For example, a position of Business Analyst is defined by the Systems Development organization unit. Carl Gerber, while employed by the Data Warehousing organization unit, is assigned the position of Systems Analyst. In the spirit of universal data modeling, enhance Figure 3-16 for the most general case consistent with this description.