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

Interlude Use of webcam (getUserMedia) – tml5examples.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 – 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 computing.com/articles/internet-things- requirements-protocols/ 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?