Claims Analysis: Example ‘Hall of Fame/Shame’ Presentation Chris North CS 3724: Intro to HCI

Presentations (Hall of Fame/Shame) See course calendar on website Teams of 2 5% of grade 5 minutes, 3-4 slides Practice Bring on CD, usb key, or laptop Pick UI of your choice (software or real-world) UI critique Scenarios Claims analysis (include pictures) Redesign ideas Vote: UI Hall of Fame/Shame

UI: Fast Food Drive-Thru Menus Scenario: College students (Bburg) Hungry Get food, get out. FAST! Often: sandwich, fries, drink Typically: Not sure what I want Sometimes: Know what I want Passengers want food too Budget is important, limited cash Note: Tell the story of the users and their tasks, highlighting key requirements.

Claims 1 Design choice 1: Billboard menu – large visual tabular layout of all food choices: + all in one view enables fast decisions for the students + organized by categories supports quick browsing + tabular layout fast for visually scanning prices (supports the budget-minded students) - see menu too late, slows down ordering process or rushed - passengers can’t see menu well, not happy with order Note: Identify important UI design choice in the system, then identify the +/- measurable effects of that choice on the users in the scenario.

Claim 1a: example of detailed choice Design choice 1a: Billboard menu uses pictures of meals instead of text + helps them visually decide what they are hungry for + pictures faster than reading textual descriptions - pictures take up a lot of space, big sign difficult for passengers to see - some pictures look similar, reducing order accuracy Note: It is important to consider what the alternative design choices would have been (e.g. textual menu).

Claims 2 Design choice 2: Microphone/Speaker voice-based interaction + easy access, fast and no learning + human in the loop, supports error recovery & questions - passengers must order thru driver: slow, errors - winter, Brrrrr! Low subjective satisfaction - can’t understand what they say, poor audio feedback: errors and limited cost feedback - they can’t hear me over my ’87 VW -- do students drive old cars?

Other potential good design choices Combo meals +Make common tasks fast Separate Budget menu (e.g. Wendy’s $1 menu) +Gives limited-cash students 1 place to look on menu Get price before proceeding +Can get out cash while waiting, saves time Visual feedback on order (e.g. Wendy’s LCD screen) +More order accuracy, price break-down

Re-Design Ideas Simple re-design ideas: More billboard menus back in line + ready to order when reach microphone - might be confusing where to order? Menu on both sides of car Microphone on both sides of car Radical re-design: cell phone, in-car UI + solves audio problems + solves winter problems + solve passenger problem, can hand-off phone + could order before arriving if no menu needed, faster -Possible Cell phone call costs - Time to dial # Note: Identify alternative design choices, how they would address -’s, and what new +/-’s are introduced.

Identifying Design Trade-offs Microphone on 1 side - Slow and mistakes on passenger orders + forces serial order + 1 window down in winter + standard, no learning Microphone on 2 sides +Fast and Accurate passenger order - confusion when both talk at same time - 2 windows down in winter - non-standard, some initial learning req’d