System Analysis and Design, Fifth Edition

CHAPTER 5

PROCESS MODELING

A process model describes business processes—the activities that people do. Process models are developed for the as-is system and/or the to-be system. This chapter describes data flow diagramming, one of the most commonly used process modeling techniques.

OBJECTIVES

• Explain the rules and style guidelines for data flow diagrams.
• Describe the process used to create data flow diagrams.
• Create data flow diagrams.

CHAPTER OUTLINE

Introduction

Data Flow Diagrams

• Reading Data Flow Diagrams
• Elements of Data Flow Diagrams
• Using Data Flow Diagrams to Define Business Processes
• Process Descriptions

Creating Data Flow Diagrams

• Creating the Context Diagram
• Creating Data Flow Diagram Fragments
• Creating the Level 0 Data Flow Diagram
• Creating Level 1 Data Flow Diagrams (and Below)
• Validating Data Flow Diagrams

Applying the Concepts at Tune Source

• Creating the Context Diagram
• Creating Data Flow Diagram Fragments
• Creating the Level 0 Data Flow Diagram
• Creating Level 1 Data Flow Diagrams (and Below)
• Validating Data Flow Diagrams

Summary

INTRODUCTION

Chapters 3 and 4 discussed several requirements elicitation activities, such as interviewing and JAD, and how to clarify those requirements by developing more detailed use cases. In this chapter, we discuss how the requirements definition and use cases may be further clarified through a process model. You may have heard ...