Chapter 04 IM - Systems Analysis and Design, Sixth Edition...

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Systems Analysis and Design, Sixth Edition Page 1 of 16 Systems Analysis and Design Sixth Edition Instructor’s Manual CHAPTER FOUR Data and Process Modeling LESSON PLAN OBJECTIVES When students finish this chapter, they will be able to: Describe data and process modeling concepts and tools, including data flow diagrams, a data dictionary, and process descriptions Describe the symbols used in data flow diagrams and explain the rules for their use Draw data flow diagrams in a sequence, from general to specific Explain how to level and balance a set of data flow diagrams Describe how a data dictionary is used and what it contains Use process description tools, including structured English, decision tables, and decision trees Describe the relationship between logical and physical models INSTRUCTOR NOTES Introduction, 146 LECTURE NOTES Define data and process modeling. Compare data and process modeling to the requirements modeling process described in Chapter 3. Differentiate between a logical model and a physical model . A logical model shows what a system must do without committing to a technology. This allows a development team to focus on what is needed instead of what form it will take. For example, a logical model could specify output as a list of data, without committing to a specific format. A physical model would include details about the format. Usually, systems analysis requires creating detailed logical models, while systems design requires physical models. List the four main tools involved in enterprise modeling. Preview what students will learn in Chapter 5. Present the Chapter Introduction Case: Mountain View College Bookstore on page 147. This introduction case sets up the material developed in the chapter. Review the background, participants, project status, and discussion topics for the case. Discuss Figure 4-1. CLASSROOM ACTIVITIES Consider assigning students to each role in the Chapter Introduction Case: Mountain View College Bookstore on page 147 and having them enact the case dialogue.
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Page 2 of 16 Chapter 4, Enterprise Modeling Overview of data and process modeling tools, 148 LECTURE NOTES Define data flow diagram ( DFD ). Unlike an entity-relationship diagram (ERD), which is described in Chapter 7, which shows the data needed by a system, including items about which information is stored and the relationships among them, a DFD shows inputs, processes, storage, and outputs of a system. Refer students to Part 2 of the Systems Analyst’s Toolkit for explanation of how to document business functions and processes, develop graphical models, and provide an overall framework for information system development. QUICK QUIZZES
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