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Writing Effective Use Cases (01 Edition)

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Writing Effective Use Cases (01 Edition) Cover

 

Synopses & Reviews

Publisher Comments:

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

Book News Annotation:

A specialist in object technology presents software developers with a current guide to writing use cases as a means of capturing the behavioral requirements of software systems and business practices. Covers key elements of use cases, a style guide with suggested formats, a list of time-saving writing tips, a set of use case templates with commentary, and learning exercises with answers to clarify important points.
Annotation c. Book News, Inc., Portland, OR (booknews.com)

Synopsis:

This guide should help readers learn how to employ the significant power of use cases to their software development efforts. It provides a practical methodology, presenting key use case concepts.

Synopsis:

In "Writing Effective Use Cases, " Cockburn offers a hands-on, soup-to-nuts guide to use case development, based on the proven concepts he has refined through years of research, development, and seminar presentations.

About the Author

Alistair Cockburn is a recognized expert on use cases. He is consulting fellow at Humans and Technology, where he is responsible for helping clients succeed with object-oriented projects. He has more than twenty years of experience leading projects in hardware and software development in insurance, retail, and e-commerce companies and in large organizations such as the Central Bank of Norway and IBM.

0201702258AB07302002

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.

USE CASE 6 Add New Service (Enterprise).

USE CASE 7 Add New Service (Acura).

Many Computers to One Application.

USE CASE 8 Enter and Update Requests (Joint System).

USE CASE 9 Add New Service (into Acura).

USE CASE 10 Note New Service Request (in BSSO).

USE CASE 11 Update Service Request (in BSSO).

USE CASE 12 Note Updated Request (in Acura).

Figure 11: Use Case Diagrams for Acura-BSSO.

Figure 12: A Combined Use Case Diagram for Acura-BSSO.

Nuts and Bolts Use Cases.

USE CASE 13 Serialize Access to a Resource.

USE CASE 14 Apply a Lock Conversion Policy.

USE CASE 15 Apply an Access Compatibility Policy.

USE CASE 16 Apply an Access Selection Policy.

USE CASE 17 Make Service Client Wait for Resource Access 49

The Outermost Use Cases.

Using the Scope-Defining Work Products.

Exercises.
4. Stakeholders and Actors.

Stakeholders.

The Primary Actor.

Why Primary Actors Are Unimportant (and Important).

Actors versus Roles.

Characterizing the Primary Actors.

Table a Sample Actor Profile Table.

Supporting Actors.

The System Under Discussion.

Internal Actors and White-Box Use Cases.

Exercises.
5. Three Named Goal Levels.

User Goals (Blue, Sea-Level).

Figure 13: Use Case Levels.

Two Levels of Blue.

Summary Level (White, Cloud/ Kite).

USE CASE 18 Operate an Insurance Policy+.

The Outermost Use Cases Revisited.

Subfunctions (Indigo/Black, Underwater/Clam).

Summarizing Goal Levels.

Using Graphical Icons to Highlight Goal Levels.

Finding the Right Goal Level.

Finding the User's Goal.

Raising and Lowering Goal Levels.

Figure 14: Ask “Why” to Shift Levels.

A Longer Writing Sample: “Handle a Claim” at Several Levels.

USE CASE 19 Handle a Claim (Business).

USE CASE 20 Evaluate Work Comp Claim.

USE CASE 21 Handle a Claim (Systems) +.

USE CASE 22 Register a Loss.

USE CASE 23 Find a Whatever (Problem Statement).

Exercises.
6. Preconditions, Triggers, and Guarantees.

Preconditions.

Minimal Guarantees.

Success Guarantee.

Triggers.

Exercises.
7. Scenarios and Steps.

The Main Success Scenario.

The Common Surrounding Structure.

The Scenario Body.

Action Steps.

Guidelines.

GUIDELINE 1: Use Simple Grammar.

GUIDELINE 2: Show Clearly “Who Has the Ball”.

GUIDELINE 3: Write from a Bird's Eye View.

GUIDELINE 4: Show the Process Moving Forward.

GUIDELINE 5: Show the Actor's Intent, Not the Movements.

GUIDELINE 6: Include a “Reasonable” Set of Actions.

Figure 15: A Transaction Has Four Parts.

GUIDELINE 7: “Validate,” Don't “Check Whether”.

GUIDELINE 8: Optionally Mention the Timing.

GUIDELINE 9: Idiom: “User Has System a Kick System B”.

GUIDELINE 10: Idiom: “Do Steps x-y Until Condition”.

To Number or Not to Number.

Exercises.
8. Extensions.

Extension Basics.

The Extension Conditions.

Brainstorm All Conceivable Failures and Alternative Courses.

GUIDELINE 11: Make the Condition Say What Was Detected.

Rationalize the Extensions List.

Rollup Failures.

Extension Handling.

GUIDELINE 12: Indent Condition Handling.

Failures within Failures.

Creating a New Use Case from an Extension.

Exercises.
9. Technology and Data Variations.

Figure 16: Technology Variations Using Specialization in UML.
10. Linking Use Cases.

Sub Use Cases.

Extension Use Cases.

Figure 17: UML Diagram of Extension Use Cases.

When to Use Extension Use Cases.

Exercises.
11. Use Case Formats.

Formats to Choose From.

Fully Dressed.

USE CASE 24 Fully Dressed Use Case Template.

Casual.

USE CASE 25 Actually Login (Casual Version).

One-Column Table.

Table 1 One-Column Table Format of a Use Case.

Two-Column Table.

Table 1 Two-Column Table.

RUP Style.

USE CASE 26 Register for Courses.

If-Statement Style.

Occam Style.

Diagram Style.

The UML Use Case Diagram.

Forces Affecting Use Case Writing Styles.

Consistency.

Complexity.

Standards for Five Project Types.

For Requirements Elicitation.

USE CASE 27 Elicitation Template—Oble a New Biscum.

For Business Process Modeling.

USE CASE 28 Business Process Template—Symp a Carstromming.

For Sizing the Requirements.

USE CASE 29 Sizing Template—Burble the Tramling.

For a Short, High-Pressure Project.

USE CASE 30 High-Pressure Template: Kree a Ranfath.

For Detailed Functional Requirements.

USE CASE 31 Use Case Name—Nathorize a Permion.

1Conclusion.

1Exercise.
PART II. FREQUENTLY DISCUSSED TOPICS.

12. When Are We Done.

On Being Done.
13. Scaling Up to Many Use Cases.

Say Less about Each One (Low-Precision Representation).

Create Clusters of Use Cases.
14. CRUD and Parameterized Use Cases.

CRUD Use Cases.

USE CASE 32 Manage Reports.

USE CASE 33 Save Report.

Parameterized Use Cases.
15. Business Process Modeling.

Modeling versus Designing.

Work from the Core Business.

Figure 18: Core Business Black Box.

Figure 19: New Business Design in White Box.

Work from Business Process to Technology.

Figure 20: New Business Design in White Box (Again).

Figure 21: New Business Process in Black-Box System Use Cases.

Work from Technology to Business Process.

Linking Business and System Use Cases.

Rusty Walters: Business Modeling and System Requirements.
16. The Missing Requirements.

Precision in Data Requirements.

Cross-linking from Use Cases to Other Requirements.

Figure 22: “Hub-and-Spoke” Model of Requirements.
17. Use Cases in the Overall Process.

Use Cases in Project Organization.

Organize by Use Case Titles.

Table 1 Sample Planning Table.

Handle Use Cases Crossing Releases.

Deliver Complete Scenarios.

Use Cases to Task or Feature Lists.

USE CASE 34 Capture Trade-In.

Table Work List for Capture Trade-In.

Use Cases to Design.

A Special Note to Object-Oriented Designers.

Use Cases to UI Design.

Use Cases to Test Cases.

USE CASE 35 Order Goods, Generate Invoice (Testing Example).

Table 1 Main Success Scenario Tests (Good Credit Risk).

Table 1 Main Success Scenario Tests (Bad Credit Risk).

The Actual Writing.

A Branch-and-Join Process.

Time Required per Use Case.

Collecting Use Cases from Large Groups.

Andy Kraus: Collecting Use Cases from a Large, Diverse Lay Group.
18. Use Case Briefs and Extreme Programming.

19. Mistakes Fixed.

No System.

No Primary Actor.

Too Many User Interface Details.

Very Low Goal Levels.

Purpose and Content Not Aligned.

Advanced Example of Too Much UI.

USE CASE 36 Research a Solution—Before.

USE CASE 37 Research Possible Solutions—After.

PART III. REMINDERS FOR THE BUSY.

Chatper 21. Reminders for Each Use Case.

Reminder 1: A Use Case Is a Prose Essay.

Reminder 2: Make the Use Case Easy to Read.

Reminder 3: Just One Sentence Form.

Reminder 4: “Include” Sub Use Cases.

Reminder 5: Who Has the Ball.

Reminder 6: Get the Goal Level Right.

Figure 23: Ask “Why” to Shift Levels.

Reminder 7: Keep the GUI Out.

Reminder 8: Two Endings.

Reminder 9: Stakeholders Need Guarantees.

Reminder 10: Preconditions.

Reminder 11: Pass/Fail Tests for One Use Case.

Table 2 Pass/Fail Tests for One Use Case.
22. Reminders for the Use Case Set.

Reminder 12: An Ever-Unfolding Story.

Reminder 13: Both Corporate Scope and System Scope.

Reminder 14: Core Values and Variations.

Reminder 15: Quality Questions across the Use Case Set.
23. Reminders for Working on the Use Cases.

Reminder 16: It's Just3 (Where's Chapter 4?).

Reminder 17: Work Breadth First.

Figure 24: Work Expands with Precision.

Reminder 18: The 12-Step Recipe.

Reminder 19: Know the Cost of Mistakes.

Reminder 20: Blue Jeans Preferred.

Reminder 21: Handle Failures.

Reminder 22: Job Titles Sooner and Later.

Reminder 23: Actors Play Roles.

Reminder 14: The Great Drawing Hoax.

Figure 25: “Mommy, I Want to Go Home.”.

Figure 26: Context Diagram in Ellipse Figure Form.

Table 2 Actor-Goal List for Context Diagram.

Reminder 25: The Great Tool Debate.

Reminder 26: Project Planning Using Titles and Briefs.
Appendices.

Appendix A. Use Cases in UML.

A.1 Ellipses and Stick Figures.

A.2 UML's Includes Relation.

Figure A.1: Drawing Includes.

GUIDELINE 13: Draw Higher Goals Higher.

A.3 UML's Extends Relation.

Figure A.2: Drawing Extends.

GUIDELINE 14: Draw Extending Use Cases Lower.

GUIDELINE 15: Use Different Arrow Shapes.

Correct Use of Extends.

Figure A.3: Three Interrupting Use Cases Extending a Base Use Case.

Extension Points.

A.4 UML's Generalizes Relations.

Correct Use of Generalizes.

Figure A.4: Drawing Generalizes.

Draw General Goals Higher.

Hazards of Generalizes.

Figure A.5: Hazardous Generalization — Closing a Big Deal.

Figure A.6: Correctly Closing a Big Deal.

A.5 Subordinate versus Sub Use Cases.

A.6 Drawing Use Case Diagrams.

GUIDELINE 16: User Goals in a Context Diagram.

GUIDELINE 17: Supporting Actors on the Right.

A.7 Write Text-based Use Cases Instead.
Appendix B. Answers to (Some) Exercises.

Chapter 3 (page 51).

Figure B.1: Design Scopes for the ATM.

Chapter 4 (page 60).

Chapter 5 (page 79).

Chapter 6 (page 85).

Chapter 7 (page 98).

USE CASE 38 Use the Order Processing System.

Chapter 8 (page 110).

USE CASE 39 Buy Stocks Over the Web.

Chapter 11 (page 138).

USE CASE 40 Perform Clean Spark Plugs Service.
Appendix C: Glossary.

Appendix D: Readings

Index. 0201702258T04062001

Product Details

ISBN:
9780201702255
Author:
Cockburn, Alistair
Publisher:
Addison-Wesley Professional
Location:
Boston
Subject:
Programming - Object Oriented Programming
Subject:
Application Software - General
Subject:
Application software
Subject:
Development
Subject:
Use cases
Subject:
Programming / Object Oriented
Subject:
Application software -- Development.
Subject:
Use cases (Systems engineering)
Subject:
Software Engineering-Object Oriented Programming
Subject:
Programming - General
Subject:
Programming - Software Development
Copyright:
Edition Description:
Trade paper
Series:
Agile Software Development Series
Series Volume:
[29]
Publication Date:
October 2000
Binding:
TRADE PAPER
Grade Level:
Professional and scholarly
Language:
English
Pages:
304
Dimensions:
9 x 7.5 x 0.614 in 508 gr

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Writing Effective Use Cases (01 Edition) New Trade Paper
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Product details 304 pages Addison-Wesley Professional - English 9780201702255 Reviews:
"Synopsis" by , This guide should help readers learn how to employ the significant power of use cases to their software development efforts. It provides a practical methodology, presenting key use case concepts.
"Synopsis" by , In "Writing Effective Use Cases, " Cockburn offers a hands-on, soup-to-nuts guide to use case development, based on the proven concepts he has refined through years of research, development, and seminar presentations.
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