1. 12/09/051 Olin CollegeHFID – Team Stilton Blue Franklin W. Olin College of Engineering, December 09, 2005 Team Stilton Blue: Zach Brock,Luis Diego Cabezas, Alex Dorsk Faculty Adviser: Prof. Lynn Andrea Stein Car Sound System

2. Goal: to learn about interface design by designing a more usable car sound system for people in their mid-twenties. Our design process Our current design Lessons learned 12/09/05 2 Olin CollegeHFID – Team Stilton Blue Overview

3. User interviews Creation of test personas & initial designs Low-fi prototype testing through interviews Interactive prototype Refinement through heuristic evaluation Further refinement through user interviews 12/09/05 3 Olin CollegeHFID – Team Stilton Blue Our design process

4. We interviewed passengers and drivers. We asked them What they do in their cars How they use their current sound systems What they want their sound systems to do 12/09/05 4 Olin CollegeHFID – Team Stilton Blue User Interviews

5. Identified from the user interview data. Specific goals unique to our users: Being able to drive safely while using a system Being able to use auxiliary music players (i.e. iPods) while driving Being able to use cellphones while driving 12/09/05 5 Olin CollegeHFID – Team Stilton Blue Design Goals

6. 12/09/05 6 Olin CollegeHFID – Team Stilton Blue Test Personas

7. Our first designs had features such as: Large, graphical mode buttons and a touch screen Steering wheel controls Integration with a car’s main computer Integrated auxiliary device controls Cellphone controls 12/09/05 7 Olin CollegeHFID – Team Stilton Blue Initial Designs

8. We tested our initial designs in the context of our personas. We also used low-fidelity paper prototypes to test our designs with real users. 12/09/05 8 Olin CollegeHFID – Team Stilton Blue Testing Initial Designs

9. 12/09/05 9 Olin CollegeHFID – Team Stilton Blue Low-fidelity Prototypes

10. Tests with personas and paper prototypes told us how we could refine our designs. We decided to: Simplify displays Maintain standard modes in our design Keep information density low 12/09/05 10 Olin CollegeHFID – Team Stilton Blue Design Refinement

11. Attempted to maintain familiar interactions The dynamic panel physically rotates to provide a different button layout in each mode The static panel contains the options and controls available in all modes 12/09/05 11 Olin CollegeHFID – Team Stilton Blue First Interactive Prototype

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13. Based on feedback from a heuristic evaluation we made additional changes: More text labels Standardized buttons Simplified CD interface Linear staggered CD button mapping Changed color of on/off button Standardized control buttons for switching tracks/stations 12/09/0513 Olin CollegeHFID – Team Stilton Blue Second Interactive Prototype

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16. Based on user interactions with our second interactive prototype we made additional changes: Mode buttons light up to show current mode Clearer volume knob On/off button became only ‘off’ button 12/09/05 16 Olin CollegeHFID – Team Stilton Blue Third Interactive Prototype

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18. Is easy to use and learn The simplicity limits errors Maintains mental model of car stereo Physically separates different modes Layout of buttons and separation of panels allows users to feel for controls, improving safety 12/09/05 18 Olin CollegeHFID – Team Stilton Blue Advantages

19. Limits range of interaction Requires adapting to current mode before using There is an imposed time delay due to the physical changing of modes 12/09/05 19 Olin CollegeHFID – Team Stilton Blue Disadvantages

20. Let’s see what the first interactive prototype looks like… 12/09/05 20 Olin CollegeHFID – Team Stilton Blue Demo of Final Prototype

21. Testing early with users helps Doing test run-throughs (walking through the script, etc.) helps make tests effective It’s hard to think of new ideas when you have ideas that work, especially in existing or mature systems KISS: Keep it simple, stupid. All of our design changes involved simplifying previous designs 12/09/05 21 Olin CollegeHFID – Team Stilton Blue Lessons Learned

22. 12/09/05 22 Olin CollegeHFID – Team Stilton Blue Questions?