Systems Analysis and Design, 4th 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

• Understand the rules and style guidelines for data flow diagrams.
• Understand the process used to create data flow diagrams.
• Be able to 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

Appendix 5A: Supplemental DFDs for Holiday Travel Vehicles

INTRODUCTION

The previous chapters discussed requirements activities, such as interviewing and JAD, and how to transform those requirements into more detailed use cases. In this chapter, we discuss how the requirements definition and use cases are further refined ...