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Exploring User Interaction With Key-Based and Touchscreen Interfaces

This document outlines various aspects of human-computer interaction (HCI) focusing on key-based and touchscreen user interfaces. It discusses the actions users perform with physical and soft keyboards, challenges in creating interface elements, and experimentation methods. It also emphasizes teamwork through learning pairs for collaborative analysis of HCI concepts, structure of research papers, and methodologies for evaluating user interactions. Lastly, it suggests future research directions and the importance of effective communication in the design and evaluation of interfaces.

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Exploring User Interaction With Key-Based and Touchscreen Interfaces

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  1. Human Computer InteractionCSC 4730-100User System InterfaceCSC 8570-001 Meeting 2 September 4, 2012

  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. iPadtouchscreen), what do you do the keys? Another verb, perhaps the same one, perhaps not.

  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?

  4. Partnerships • Form learning pairs as follows: • Kristin & Kevin • Ken & Tyler • James & James • Andrew & Andrew • Chris & Shishir • John & Anthony • Donald & Bharath & Michael • Move to separate spaces in the room or in an adjacent room.

  5. 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.

  6. Pair Reports • Paper structure • Concepts, phrases, descriptions

  7. Wigdor & Balakrishnan (3) Paper structure (9 sections: 6 main, 3 supplemental) • Abstract • Introduction • Related Work • Design Issues • Evaluation • Discussion • Conclusions and Future Work • Acknowledgements • References (15)

  8. Wigdor & Balakrishnan (4) Questions: • Circumstances of 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

  9. Wigdor & Balakrishnan (5) Questions (continued) • 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

  10. Wigdor & Balakrishnan (6) Questions (continued) • Key tilt @ keystroke level: push button, tilt phone, release button • Absolute tilt @ keystroke level: tilt phone, push button • Software still available? • Number of participants, compensation

  11. Wigdor & Balakrishnan (7) Questions (continued) • Corpus of text messages? • Each treatment? • Within subjects design? • Experimental design summary? • Faster than computation? • Analysis of variance? • Power law of learning? • Best fit curve?

  12. Wigdor & Balakrishnan (8) Questions (continued) • Fitts’ Law vs. Fitt’s Law • Definitive definition of tilt parameter? • Model based on Accot & Zhai • Working relative tilt implemention? Tilt Text in action

  13. Wigdor & Balakrishnan (9) 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. HCI Research • Research project description More examples: • MacKenzie, Kauppinen, 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.

  15. Next time (1) • Perform Experiment 8 and submit the results next time.

  16. Next Time (2) • Choose research project team (at most three members) and topic area. The topic should involve user interaction with small devices or the human computer interface for these devices. • Report the team and the topic area to the instructor by Tuesday, September 11 at noon.Note the early deadline.

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