Microsoft PowerPoint seg3101-ch2-3 ElicitationTechniques ppt



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SEG3101-ch2-3 - ElicitationTechniques.docx

Types of Scenarios

As-is scenario
• Used in describing a 
current situation
, usually used in re-engineering 
projects, the user describes the system

Visionary scenario
• Used to describe a 
future system
, usually used in greenfield
engineering and reengineering projects
• Can often not be done by the user or developer alone

Evaluation scenario
• User tasks against which the system is to be evaluated

Training scenario
• Step by step instructions that guide a novice user through a system
Elicitation Techniques Existing Systems Interviews
Brainstorming Joint Application Design Prototyping
Use Cases


75
SEG3101 (Fall 2010). Requirements Elicitation Techniques
Representation of Scenarios (1)

Various approaches
• Text (informal, formal), diagrams (state, sequence ...), video, 
animation, comics, storyboard, collaborative workshops (pass the
microphone or the ball)…
• There are specialized notation such as UML (sequence, activity, use 
case, interaction, and collaboration diagrams), Message Sequence
Charts (MSC), Live Sequence Charts, and Use Case Maps (UCM) 
Elicitation Techniques Existing Systems Interviews
Brainstorming Joint Application Design Prototyping
Use Cases


76
SEG3101 (Fall 2010). Requirements Elicitation Techniques
Representation of Scenarios (2)

Different representations may be useful in specific situations
• For example, 
storyboards
, often used in the film industry, can describe 
situations, roles, and sequences of tasks in a fast, compact, and 
polyglot way
1

Some scenario-based approaches are very ideological or 
dogmatic 
[1] I. Alexander
Elicitation Techniques Existing Systems Interviews
Brainstorming Joint Application Design Prototyping
Use Cases


77
SEG3101 (Fall 2010). Requirements Elicitation Techniques

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