Creating User Interfaces

Creating User Interfaces General issues. Classwork/homework: embedded computing project

Interlude • Use of webcam (getUserMedia) • http://faculty.purchase.edu/jeanine.meyer/morehtml5examples.html • Why do the mirror?

Cognitive load • What does the user need to know and/or remember? • Memory (short term and long term) • Operational skills • ? • Area of active research

Recognition vs Recall • Notion that users can more easily recognize something from a (short) list of options versus recalling. • Less error prone

Refrain on errors • How to prevent? Being pro-active • How to recover • Ways to present possibilities, for example, confirmation operation. • Some errors can be detected by the program, some not. • How to backup efficiently

Network effects • Going from single application on one device to • Application with connections, required or optional with other applications • Example: use Facebook for login (authorization) • May lead to posting information • Example: backup, store, retrieve from iCloud, Google Drive, other • Applications present on multiple devices with some/considerable sharing • Example: Duolingo common status

Network effects Expectations and training; We now are willing and expect to • enter password twice • get option to save password, other information • use dropdown menus • click on maps • More?

Network effects • [Even in these special purpose, embedded applications] • Option in ATM to send receipt using email • Option to set up to always do this. • Option to set up first screen • Other?

Timing • Real-time • Immediately, no perceived delay (latency) • Look up definitions! • Embedded applications often need to be real-time • Database operations • Need to prevent clashes while minimizing waits. • Avoid deadly embrace • Two or more threads each waiting for the other to complete a task

Paying: Now and future • Pay via • Recorded credit card, EFT, Paypay, bitcoin • Pay by touching phone • Pay NOT explicit • recorded automatically when car pulls in and leaves. Does this happen anywhere? • ?

Voting machines • Was move to optical scanner from lever machines good? • Positive features? • Negative features? • Why not online at site or not at site?

Internet of Things • Evolving set of protocols for connecting devices over Internet or other networks • See http://embedded-computing.com/articles/internet-things-requirements-protocols/ • Responsiveness, scalability, robustness, etc. extra requirements over [merely] connecting computers and other mobile devices

[More] Applications • Military • Medical • Other • May assume users are trained!

Computer information system • Old definition, but still has value • CIS includes • Hardware • Software • People • Procedures

Documentation • 1-pager • SUMMARY: what were you studying? What were the tasks (or some of the tasks)? Who were the subjects? What was the most important/surprising/anticipated findings? • PROOFREAD • Photograph(s) of interface, environment (if important) • Presentation: more details, but still “major on the majors”. • Details then analysis and summary

Analysis • Consider & Talk about • Usability definition(s) • Effectiveness, efficiency, satisfaction • Cognitive load • Networking effects • Error prevention and recovery • Timing • Interactions of people and [intended] procedure with hardware and software • More

Classwork • What are your plans? What is your approach?

Creating User Interfaces