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Writing Effective Use Cases, 1st edition

  • Alistair Cockburn

Published by Addison-Wesley Professional (October 5th 2000) - Copyright © 2001

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Writing Effective Use Cases

ISBN-13: 9780321605801

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Overview

Writing use cases as a means of capturing the behavioral requirements of software systems and business processes is a practice that is quickly gaining popularity. Use cases provide a beneficial means of project planning because they clearly show how people will ultimately use the system being designed. On the surface, use cases appear to be a straightforward and simple concept. Faced with the task of writing a set of use cases, however, practitioners must ask: "How exactly am I supposed to write use cases?" Because use cases are essentially prose essays, this question is not easily answered, and as a result, the task can become formidable.

In Writing Effective Use Cases, object technology expert Alistair Cockburn presents an up-to-date, practical guide to use case writing. The author borrows from his extensive experience in this realm, and expands on the classic treatments of use cases to provide software developers with a "nuts-and-bolts" tutorial for writing use cases. The book thoroughly covers introductory, intermediate, and advanced concepts, and is, therefore, appropriate for all knowledge levels. Illustrative writing examples of both good and bad use cases reinforce the author's instructions. In addition, the book contains helpful learning exercises--with answers--to illuminate the most important points.

Highlights of the book include:

  • A thorough discussion of the key elements of use cases--actors, stakeholders, design scope, scenarios, and more
  • A use case style guide with action steps and suggested formats
  • An extensive list of time-saving use case writing tips
  • A helpful presentation of use case templates, with commentary on when and where they should be employed
  • A proven methodology for taking advantage of use cases

With this book as your guide, you will learn the essential elements of use case writing, improve your use case writing skills, and be well on your way to employing use cases effectively for your next development project.



0201702258B04062001

Table of contents



Preface.


Acknowlegments.


1. Introduction.

What Is a Use Case (More or Less)?

USE CASE 1. Buy Stocks over the Web.

USE CASE 2. Get Paid for Car Accident.

USE CASE 3. Register Arrival of a Box.

Your Use Case Is Not My Use Case.

USE CASE 4. Buy Something (Casual Version).

USE CASE 5. Buy Something (Fully Dressed Version).

Steve Adolph: “Discovering” Requirements in New Territory.

Requirements and Use Cases.

Use Cases as Project-Linking Structure.

Figure 1: The “Hub-and-Spoke” Model of Requirements.

When Use Cases Add Value.

Manage Your Energy.

Warm Up with a Usage Narrative.

Usage Narrative: Getting “Fast Cash”.

Exercises.

PART I. THE USE CASE BODY PARTS.

2. The Use Case as a Contract for Behavior.

Interactions between Actors with Goals.

Actors Have Goals.

Figure 2: An Actor with a Goal Calls on the Responsibilities of Another.

Goals Can Fail.

Interactions Are Compound.

A Use Case Collects Scenarios.

Figure 3: Striped Trousers: Scenarios Succeed or Fail.

Figure 4: The Striped Trousers Showing Subgoals.

Contract between Stakeholders with Interests.

Figure 5: The Sud Serves the Primary Actor, Protecting Offstage Stakeholders.

The Graphical Model.

Figure 6: Actors and Stakeholders.

Figure 7: Behavior.

Figure 8: Use Case as Responsibility Invocation.

Figure 9: Interactions as Composite.
3. Scope.

Table a Sample In/Out List.

Functional Scope.

The Actor-Goal List.

Table a Sample Actor-Goal List.

The Use Case Briefs.

Table Sample Use Case Briefs.

Design Scope.

Figure 10: Design Scope Can Be Any Size.

Using Graphical Icons to Highlight the Design Scope.

Design Scope Examples.

Enterprise-to-System Examples.

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