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User/System Interface CSC 8570-001

Investigate interactions with digital devices and evaluate usability through experiments and partnerships for enhanced interface design.

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User/System Interface CSC 8570-001

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  1. User/System Interface CSC 8570-001 Meeting 2 September 3, 2019

  2. Beginnings SOP 1 • When you use a (physical) key-based entry device, what do you do to the keys? A verb, please. • When you use a soft keyboard (e.g. iPad touchscreen), what do you do to the keys? Another verb, perhaps the same one, perhaps not. • What other actions do you perform with your fingers (counting your thumb as a “finger”), to enter information into a computer, or control the action of it? • Same question, but now interacting with a small screen device such as a mobile phone.

  3. Table Experiment • Pass in printed table. • Name on paper • Any difficulties in creating the table? • How many columns? • How many rows? • What software system(s) did you use? • Any difficulties printing the table?

  4. Battery Operated Devices From Piazza.com (Did you think about how the interface helped or hindered you in completing your task?) • Mobile phone: 8 iPhones, 5 others • Laptop: 5 of various kinds • Watch: 7 of various kinds • Car remote: 3 • Power bank: 2 • Tablet: 1

  5. Where’s Gregor? • Google Maps (8) • Google? (2) • GPS (2) • App on phone (2) • Measuring app (1) • No answer (4)

  6. Where’s Gregor? (2) • As far as I can tell, Google Maps on my iPhone will NOT give the latitude and longitude of my position when I stand in front of Gregor. • Apple Maps (built into the iPhone) gives the latitude and longitude if • You tap the blue dot showing your location • Slide up to read the answer • Compass (built into the iPhone) gives the latitude and longitude on its opening screen • BUT, Compass reports 40° 2’ 15” N, 75° 20’ 36” W Apple Maps reports 40.0379, -75.3430 Are these equivalent answers?

  7. Partnerships • Form learning groups as follows: • Ike, Kowmundi, Pat • Jess, Josh B, Moulika • Anthony, Chaitanya, Josh C • Harsha, Taylor, Usha • Jarred, Nitin, Vamsi • Greeshma, Jos, Mounika • Bhavan, John, Sheshank • Move to separate spaces in the room, in the lobby, outside on benches or walls

  8. Wigdor & Balakrishnan • Sketch the hierarchical organization of the paper • Create a list of concepts that need further explanation, phrases that need clearer definitions, and descriptions that are just plain mysterious

  9. Partnership Reports • Paper structure • Tools for describing it • Concepts, phrases and descriptions in need of help

  10. W & B Questions • Circumstances of the paper • Average text message: 7 words • Estimate for number of text messages sent • Assertion: tilt with single keypress increases speed of text entry • Assertion: 3 techniques for overcoming key ambiguity • Key sequence 5,3,8 has 27 meanings: calculation? • Assertion: 8 ambiguous key presses on mobile phone • Assertion: 7 characters per key with upper and lower case

  11. W & B Questions (2) • Key tilt @ keystroke level: Push button, tilt phone, release button • Absolute tilt @ keystroke level: tilt phone, push button • Number of participants, compensation • Corpus of text messages • Each treatment • Within subjects design • Experimental design summary • Faster than computation

  12. W & B Questions (3) • Analysis of variance • Power law of learning • Best fit curve • Fitts’ Law vs. Fitt’s Law • Definitive definition of tilt parameter • Model based on Accot & Zhai • Working relative tilt implementation

  13. W & B Comments Grammar and form • which vs. that (Intro, l. 12) • the user … their Reference style • Alphabetized by last name • Date, volume, number, pages • Italics, bold

  14. Progress from W & B • Check authors’ current work • Check citations • Discover Gupta, et al, RotoSwype: Word-Gesture Typing using a Ring, Proc SIGCHI ‘19, Glasgow, Paper 14.

  15. USI Research • Research project description More examples • MacKenzie, Kaupinnen, Silfverberg, Accuracy measures for evaluating computer pointing devices, Proc SIGCHI ‘01, Seattle, 10-16. • Lee & Zhai, The performance of touch screen soft buttons, Proc SIGCHI ‘09, Boston, 309-318.

  16. For Next Time • Perform Experiment 8: iPad Interactions and submit the results following the instructions in the experiment • Choose research project team (at most three members) and topic area. The topic should involve user interaction with small devices, which may well be hooked to the internet. (Sounds like IoT devices are acceptable for study, but the project is not limited to IoT.) • Report the names of the team members and the topic of investigation to the instructor by noon, Monday, September 9, 2019. Note the early deadline.

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