08 Lecture

Question 1

What are the properties of a Horizontal Prototype

Answer 1

• Show a wide range of features
• Horizontal Integration (Bottom up, Top down)
• Used in linear processes (no full impl. up to the end)

Question 2

What are the properties of a Vertical Prototype

Answer 2

• Show small range of features (scenario, user story)
• Full implementation of these features
• Vertical Integration
• Used in agile processes

Question 3

Which integration Approaches are used during Prototyping?

Answer 3

• Horizontal (traditional)
• Vertical (agile)
• UI centric

Question 4

What is Revolutionary Prototyping?

Answer 4

Get user experience with throwaway version

Question 5

What are the advantages and disadvantages of Revolutionary Prototyping

Answer 5

+ Can be developed in a short amount of time

• User may have to accept that features in the prototype are expensive to implement

Question 6

What is Evolutionary Prototyping

Answer 6

Used as the basis for the implementation of the final system

Question 7

What are the advantages and the disadvantages of Evolutionary Prototyping?

Answer 7

+ Short time to market

• Can be used only if target system can be constructed in a prototype

Question 8

What are the Risks of Prototyping

Answer 8

• Developer become attached to the prototype
• Customer might not understand how much work it is to turn the prototype into a fully functional system
• User may confuse prototype and finished system
• Negative feelings towards software if prototype has problems
• Cost of prototype

Question 9

What is Storyboarding

Answer 9

Modeling the UI as Finite Automaton

Question 10

What are the advantages and disadvantages of a Low Fidelity Prototype?

Answer 10

+ Easy to produce
+ More feedback
+ No designdecisions

• Mostly not reused
• Important details are ignored

Question 11

What are the advantages and disadvantages of a High Fidelity Prototyoe?

Answer 11

+ More realistic
+ Problems can be identified more detailed
+ More impressive

• May cause much effort
• Less feedback
• High expactations

Question 12

What is Fitts’s Law (Paul Fitts, 1954)

Answer 12

Specifies how fast you can move your hand to a target of a certain size at a certain distance (within arm’s length)
T = a + b log(D/S + 1)

Question 13

What are the consequences of Fitts’s Law

Answer 13

• Targets at the screen edge are easy to hit
• Hierarchical menus are hard to hit
• Pie menus are faster tha popup menus

Question 14

What are the benefits of prototyping?

Answer 14

• Allow for early feedback
• Easy to understand
• Improve usability

Question 15

What ate risks of Prototyping?

Answer 15

• Wrong expectations about the progress of nonprogrammer

- User confusion between prototype and finished system