This section introduces you to the concepts involved in using object factories. Using the Runner part you defined in Creating a reusable nonvisual part, and the RoadRaceView you built in Creating a reusable visual part, you will learn how to use an object factory and an ordered collection. When you finish, you will have a visual part that enables you to record the number and finish time of runners in a road race and that displays the total time it took for each runner to complete the race.