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Information System Design Info-440

Information System Design Info-440. Autumn 2002 Session #8. Agenda. Admin/review Process Reminder of where we are? Conceptual modeling Break Two exercises Return quiz. Admin . Announcements Lab today: If you can, please bring scissors, tape, color pencils, etc. Anyone?

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Information System Design Info-440

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  1. Information System DesignInfo-440 Autumn 2002 Session #8

  2. Agenda • Admin/review • Process • Reminder of where we are? • Conceptual modeling • Break • Two exercises • Return quiz

  3. 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!

  4. Last time • Design spaces • Key idea: Map multiple items on a two-dimensional plot • Example dimensions: Task, product, user-satisfaction, market landscape • Task analysis/User Flows • Key idea: Represent goals and tasks • User flows are usually procedural

  5. Other path start end Task Analysis/User Flows: Symbols Goal No Task Task Decision Yes Task Task

  6. Process

  7. Development process Version Release Define: Vision/scope Needs assessment Deploy: Delivery stable technology Beta software Vision/scope document Develop: Build the technology Design: Invent the technological solution Design specifications document

  8. 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

  9. Conceptual modeling

  10. 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

  11. 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 • …

  12. Show time Three example from Quiz • The TV Guide is ordered by day. Each daylistsTV shows in a grid according to hour and station. Index - Friends 7:30 - Seinfield 8:00 TV Guide Times Shows

  13. In Skull beneath the Skin, What problem did Green and Benyon seek to solve?

  14. 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.

  15. Notation • Entities • Attributes • Relationships

  16. Relationships more • Relationships can have a degree • 1 to 1 • 1 to M • M to M • Relationships can mandatory or optional

  17. 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?

  18. Break

  19. 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?

  20. 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’.

  21. 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…

  22. 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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