Software Design Analysis: Class diagram

Consider the following description of a Police Information System: This system helps the Punjab police officers keep track of the work they are assigned to do. Officers may be assigned to investigate particular cases, to patrol particular areas, or to attend particular events such as court cases. Some work assignments are regular ongoing assignments, while others are for a particular period of time. The system information is updated by the logistics administrator, but individual officers have an interface to display their assigned work. Now give a class diagram for this system. Show classes, inheritance and associations. Include any important data members and functions. Use some UML editor such as Rational Rose or Star UML.