Systems Analysis and Design, 4th Edition

CHAPTER 4

USE CASE ANALYSIS

Use cases describe in more detail the key elements of the requirements definition. They explain the process by which the system will meet the functional requirements defined in the previous chapter. The use cases are then used to build a process model, which defines the business processes in a more formal manner.

OBJECTIVES

• Understand the role of use cases.
• Understand the process used to create use cases.
• Be able to create use cases.

CHAPTER OUTLINE

Introduction

Use Cases

Elements of a Use Case

Building Use Cases

Applying the Concepts at Tune Source

Identifying the Major Use Cases

Identifying the Major Steps for Each Use Case

Identifying the Elements within Steps

Confirming the Use Case

Summary

INTRODUCTION

The previous chapter discussed the process of requirements determination resulting in the requirements definition. The requirements definition defines what the system is to do. In this chapter, we discuss how these requirements are further refined into a set of use cases that provide more detail on the processes by which the system is to meet these requirements and the data the system needs to capture and store. Generally, each use case describes one or more system requirements. Once the use cases have been developed, the next steps are to use the requirements definition and the use cases to create even more detailed descriptions of the processes ...