Willowbrook School Chapter 6 Willowbrook School is a small private school that has retained your services as a systems analyst to assist in the development of a new information system for the school's administrative needs. Background You have developed a logical model of the proposed billing system. Now you will continue the systems analysis phase by creating an object-oriented model of the billing system. Use the logical model that you prepared in Chapter 5 as a reference. Task 1. Design and submit at least four class objects for Willowbrook's new system including attributes and methods. See Figure 6-8 on page 229 in your text for object attributes/methods illustrations.