Ans: Control flows model the paths of execution through a business process. Control flows can only be attached to actions or activities, and are depicted using a solid line with an arrowhead depicting the direction of flow. Object flows model the flow of objects through the business process. Since activities or actions modify or transform objects, object flows are necessary to show the actual objects that are used by and modified by these actions and activities. Object flows are depicted using dashed lines with arrows, and must have an activity at one end and an object at the other end. Response: See page 162