An overview of the Patterns that may be applied when working with Use Cases in the Requirements Definition Process (software development)

1. Patterns for effective Use Cases
October, 29th 2009
Maria Lekkou

2. whoami
❙ Dipl.-Ing. Elektrotechnik / Techn. Universität Athen
❙ Broadband Netzwerke für Multimedia
❙ Seit 14 J. in DE
❙ Seit 8J. Software
development
❙ Mayflower
Patterns for Effective Use Cases
© MAYFLOWER GmbH 2009 2

3. Who is...
Use Case Patterns Bin schon
heute bei Mayflower! unterwegs!
Nix wie hin!
Alistair Cockburn Steve Adolph
Patterns for Effective Use Cases
© MAYFLOWER GmbH 2009 3

4. Why talk about Use Cases?
? TEXT!
Patterns for Effective Use Cases
© MAYFLOWER GmbH 2009 4

5. Why do we need Use Cases?
requirements
validate design
feature lists
tests/QA
help, manuals
Patterns for Effective Use Cases
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6. What is a Use Case (not)?
stakeholder
system (SuD)
primary actor
behaviour
goal interaction
contract
Implementation
level scenario detail
UI design
scope
Patterns for Effective Use Cases
© MAYFLOWER GmbH 2009 6

7. Horror Use Case
Patterns for Effective Use Cases
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8. Good Use Case – part I
Patterns for Effective Use Cases
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9. Good Use Case - part II
Patterns for Effective Use Cases
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10. Scope / Goal
Patterns for Effective Use Cases
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11. Summary – level example
❙ Main Success Scenario
1. A reporting party registers a loss to insurance company
2. Clerks receives and assigns the claim to a claims adjuster
3. The assigned Claims Adjuster
conducts an investigation
evaluates damages
sets reserves
negotiates the claim
resolves the claim and closes it
Patterns for Effective Use Cases
© MAYFLOWER GmbH 2009 11

12. Actor-Goal list
Patterns for Effective Use Cases
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13. Use Case Patterns
Pattern Name
Picture
Context
Problem
Story
Forces
Solution
Examples
Patterns for Effective Use Cases
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14. DEV-> Team
BalancedTeam
SmallWritingTeam ParticipatingAudience
Patterns for Effective Use Cases
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15. DEV-> Process
BreadthBeforeDepth
MultipleForms
TwoTierReview
QuittingTime
WritersLicense
Patterns for Effective Use Cases
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16. DEV-> Editing
RedistributeTheWealth
CleanHouse
MergeDroplets
Patterns for Effective Use Cases
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17. STRUCT-> Use Case Sets
SharedClearVision
VisibleBoundary ClearCastOfCharacters
UserValuedTransactions
EverUnfoldingStory
Patterns for Effective Use Cases
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18. STRUCT-> Use Cases
CompleteSingleGoal
VerbPhraseName
PreciseAndReadable
ScenarioPlusFragments
ExhaustiveAlternatives
Patterns for Effective Use Cases
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19. STRUCT-> Scenarios / Steps
DetectableConditions
LeveredSteps
TechnologyNeutral
ForwardProcess
ActorIntentAccomplished
Patterns for Effective Use Cases
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20. Example 1
Patterns for Effective Use Cases
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21. Example 2
Patterns for Effective Use Cases
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22. Example 3
Patterns for Effective Use Cases
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23. Happy End ;)
Maria Lekkou
Mayflower GmbH
Mannhardtstr. 6
80538 München
+49 (89) 24 20 54 - 1154
maria.lekkou@mayflower.de
© Balakov (flickr)