The Information School of the University of Washington
Information System Design
Info-440
Autumn 2002
Session #8
The Information School of the University of Washington
Agenda
• Admin/review
• Process
– Reminder of where we are?
•
•
•
•
Conceptual modeling
Break
Two exercises
Return quiz
Copyright David Hendry (INFO-440
session 8 - 10/23/2002)
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The Information School of the University of Washington
Admin
• Announcements
– Lab today: If you can, please bring scissors, tape, color
pencils, etc.
– Anyone?
• Interactive design project
– To learn more about Tablet PCs, try:
http://www.pencomputing.com
– Questions?
– Proposal due: Oct 28 (Monday)
• Quizzes
– Back today!
Copyright David Hendry (INFO-440
session 8 - 10/23/2002)
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The Information School of the University of Washington
Last time
• Design spaces
– Key idea: Map multiple items on a twodimensional plot
– Example dimensions: Task, product, usersatisfaction, market landscape
• Task analysis/User Flows
– Key idea: Represent goals and tasks
– User flows are usually procedural
Copyright David Hendry (INFO-440
session 8 - 10/23/2002)
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The Information School of the University of Washington
Task Analysis/User Flows:
Symbols
Goal
start
No
Task
Decision
Yes
Task
Other path
Task
Task
end
Copyright David Hendry (INFO-440
session 8 - 10/23/2002)
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The Information School of the University of Washington
Process
The Information School of the University of Washington
Development process
Version Release
Define: Vision/scope
Deploy:
Needs assessment
Delivery stable
technology
Beta software
Vision/scope document
Develop: Build
Design: Invent the
the technology
technological solution
Design specifications
document
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session 8 - 10/23/2002)
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The Information School of the University of Washington
Length of Development
Cycle
• 1 Six month cycle
– Effective for well-established businesses
– Effective when making evolutionary
improvements
• 3 two-month cycles
– Effective for new businesses/ideas
– Effective when trying to make revolutionary
improvements
Copyright David Hendry (INFO-440
session 8 - 10/23/2002)
8
The Information School of the University of Washington
Conceptual modeling
The Information School of the University of Washington
Shift focus from ‘users’ to the
‘system’
• We’ve looked at users long enough!
– Contextual inquiry, affinity diagrams, personas,
scenarios, task analysis, etc.
• Let’s start designing!
– Key idea: Difference between logical structure
of a system and physical system
Copyright David Hendry (INFO-440
session 8 - 10/23/2002)
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The Information School of the University of Washington
Logical vs. Physical Design
• Physical: surface of the interface (skin)
– Colors, fonts, zones, grids, graphics, etc.
– Discipline: Information design
• Logical: structure underlying the interface (skull)
– Entities, relationships, attributes, operations, etc.
• Examples:
–
–
–
–
HTML tags vs. spacer gifs
Database schema vs. indexes of tables
XML vs CSS
…
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session 8 - 10/23/2002)
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The Information School of the University of Washington
Three example from Quiz
• The TV Guide is ordered by day. Each day
lists TV shows in a grid according to hour
and station.
TV
Guide
Shows
Copyright David Hendry (INFO-440
session 8 - 10/23/2002)
Index
- Friends
- Seinfield
Show
time
7:30
8:00
Times
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In Skull beneath the Skin, What
problem did Green and Benyon
seek to solve?
The Information School of the University of Washington
Notations
• In the paper Skull beneath skin, Green &
Benyon adapt Entity-Relationship Modeling
notation
– Entities
– Relationships
– Attributes
• Different modeling languages use different
notations
– Example: UML, ER, OMT, etc.
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session 8 - 10/23/2002)
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The Information School of the University of Washington
Notation
• Entities
• Attributes
• Relationships
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session 8 - 10/23/2002)
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Relationships more
• Relationships can have a degree
– 1 to 1
– 1 to M
– M to M
• Relationships can mandatory or optional
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session 8 - 10/23/2002)
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The Information School of the University of Washington
Let’s work some examples on
the board
–
–
–
–
What does the grid for the TV Guide look like?
How could we represent shows?
How could we represent times?
How could we represent the relationship
between the two?
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session 8 - 10/23/2002)
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The Information School of the University of Washington
Break
The Information School of the University of Washington
Exercise: Reverse engineer a
conceptual model for dmoz
http://dmoz.org/Sports/Skiing/
What are the entities?
What are the relationships?
What are the attributes?
What operations can be
applied to the entities?
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session 8 - 10/23/2002)
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The Information School of the University of Washington
Exercise: Develop a conceptual
model for this scenario
• Jill is a historian. She wants to help people
understand how natural and built
environments have changed over time. To
do this she wants to develop a site which will
allow people to match old photographs of
buildings, landscapes, etc. to new
photographs. Jill wants people to see, touch,
and experience ‘change’.
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session 8 - 10/23/2002)
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The Information School of the University of Washington
Quiz #1
• Good work on the quiz
- Your answers will come in handy when you
interview for jobs!
• Everyone received max points for
– Describe a conceptual model for TV Guide.
• Lydia
– Comments…
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session 8 - 10/23/2002)
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Frequency
The Information School of the University of Washington
Grade distribution on Quiz #1
Marked out of 5 (Average 4.5)
October 2002
20
18
16
14
12
10
8
6
4
2
0
s5
s4.5
s4.0
s3.5
s0
Scores
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session 8 - 10/23/2002)
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The Information School of the University of Washington
Next week
• Topics
– More on conceptual modeling
– Begin interaction design
• Metaphors and visual formalisms
• Two readings
– See syllabus
• Interactive design project
– Proposal due: Oct 28 (Monday)
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session 8 - 10/23/2002)
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