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02-Design - User-Centered Design 1 Waterfall Model...

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1 1 User-Centered Design 2 Waterfall Model Characterized by Feedback loops Testing and validation • Documentation-driven Advantages Enforced disciplined approach Disadvantages “I know this is what I asked for, but it isn’t really what I wanted.”
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2 3 Waterfall Model Is Bad for User Interface Design User interface design is risky So we are likely to get it wrong Users are not involved in validation until acceptance testing So we won’t find out until the end UI flaws often cause changes in requirements and design So we have to throw away carefully-written and tested code 4 Iterative Design Manage the inherent risk in user interface design
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3 5 Iterative Design the Wrong Way Every iteration corresponds to a release Evaluation (complaints) feeds back into next version’s design Using paying customers to evaluate usability They won’t like it They won’t buy version 2 6 Spiral Model
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4 7 Spiral Model Radial dimension: cumulative cost to date Angular dimension: progress through the spiral Each cycle of the spiral corresponds to a phase A phase begins in the top left quadrant by determining Objectives of that phase Alternatives for achieving those objectives Constraints imposed on those alternatives This process results in a strategy for achieving those objectives The strategy is analyzed from the viewpoint of risk Development starts from bottom right quadrant This quadrant corresponds to waterfall model 8 Early Prototypes Can Detect Usability Problems
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