440Chapter 9 Data DesignCase StudiesCase studies allow you to practice specific skills learned in the chapter. Each chapter containsseveral case studies that continue throughout the textbook, and a chapter capstone case.NEW CENTURY HEALTH CLINICNew Century Health Clinic offers preventive medicine and traditional medical care. In yourrole as an IT consultant, you will help New Century develop a new information system.BackgroundAfter completing the user interface, input, and output design for the new informationsystem at New Century, you will consider data design issues. Begin by studying the DFDsand object-oriented diagrams you prepared previously and the rest of the documentationfrom the systems analysis phase. Perform the following tasks:Assignments1. Create an initial entity-relationship diagram for the New Century Health Clinic system.2. Normalize your table designs.3. If you identified any new entities during normalization, create a final entity-relationshipdiagram for the system.4. Write a memo for your documentation file that contains your recommendationabout whether a file processing or a database environment should be used. Attachcopies of your ERD(s) and normalized designs.PERSONAL TRAINER, INC.Personal Trainer, Inc., owns and operates fitness centers in a dozen Midwestern cities. Thecenters have done well, and the company is planning an international expansion by openinga new “supercenter” in the Toronto area. Personal Trainer’s president, Cassia Umi, hired anIT consultant, Susan Park, to help develop an information system for the new facility.During the project, Susan will work closely with Gray Lewis, who will manage the newoperation.BackgroundAfter evaluating various development strategies, Susan prepared a system requirementsdocument and submitted her recommendations to Cassia Umi, Personal Trainer’s president.During her presentation, Susan discussed several development strategies, including in-housedevelopment and outsourcing. She did not feel that a commercial software package wouldmeet Personal Trainer’s needs.Based on her research, Susan felt it would be premature to select a development strategyat this time. Instead, she recommended to Cassia that an in-house team should develop adesign prototype, using a relational database as a model. Susan said that the prototypewould have two main objectives: It would represent a user-approved model of the new sys-tem, and it would identify all systems entities and the relationships among them. Susanexplained that it would be better to design the basic system first, and then address otherissues, including Web enhancements and implementation options. She proposed a three-stepplan: data design, user interface design, and application architecture. She explained that sys-tems analysts refer to this as the systems design phase of a development project.Cassia agreed with Susan’s recommendation, and asked her to go forward with the plan.Case Studies
Отпусти ее, - раздался ровный, холодный голос Стратмора. - Коммандер! - из последних сил позвала Сьюзан. Хейл развернул Сьюзан в ту сторону, откуда слышался голос Стратмора. - Выстрелишь - попадешь в свою драгоценную Сьюзан. Ты готов на это пойти.