Microsoft PowerPoint seg3101-ch2-3 ElicitationTechniques ppt


Use Case Edition with UCEd



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SEG3101-ch2-3 - ElicitationTechniques.docx

Use Case Edition with UCEd
Use Case model
(use case, extend, 
include, actor…)
Use Case
model edition 
area
Use Case
description
Use Case
description 
edition area
Elicitation Techniques Existing Systems Interviews
Brainstorming Joint Application Design Prototyping
Use Cases


115
SEG3101 (Fall 2010). Requirements Elicitation Techniques
UCEd Model Import in jUCMNav
Elicitation Techniques Existing Systems Interviews
Brainstorming Joint Application Design Prototyping
Use Cases


116
SEG3101 (Fall 2010). Requirements Elicitation Techniques
Don’t be Negative, But…

Be ready to face the music!
• In business, some people might wish to see you fail…
• There are unforeseen events in any project
• Open systems are subject to various threats
• Software contains various kinds of bugs

Remember Murphy’s Law…
• “Anything that can go wrong will go wrong.”
Elicitation Techniques Existing Systems Interviews
Brainstorming Joint Application Design Prototyping
Use Cases


117
SEG3101 (Fall 2010). Requirements Elicitation Techniques
Think about Negative Scenarios?


negative scenario
is a scenario whose goal is
• Undesirable from the business organization’s viewpoint
• Desirable from a hostile agent’s viewpoint (not necessarily human)

Consider them beforehand
• As well as potential solutions

Or…
• Wait until it is too late to react…
Elicitation Techniques Existing Systems Interviews
Brainstorming Joint Application Design Prototyping
Use Cases


118
SEG3101 (Fall 2010). Requirements Elicitation Techniques
Misuse Case

Proposed by Sindre et Opdahl (2000)
• Capture use cases that a system must be protected against
• Goal is to threaten the system
• Obvious applications for security and risk analysis

The misuse case’s 
misactor
is a hostile agent

The colors of the ellipse are inverted
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