Principles of Human-Computer Interaction Crowd-Powered Systems Alexander J. Quinn April 28, 2015.

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Presentation transcript:

Principles of Human-Computer Interaction Crowd-Powered Systems Alexander J. Quinn April 28, 2015

hci.ecn.purdue.edu Dual Xeon E5-2680v3 CPUs 24 cores / GHz 128 GB RAM 2133 million transfers/second 8 TB storage Near-line storage, RAID6 w/ 4 x 2TB Dual power supplies 450W, hot-swappable

“Performance”  requests per second  uptime  average response time  peak response time  network throughput  mean time between failures  …

“Performance”

Gulf of execution (Don Norman, 1986)

Direct manipulation Represent objects by physical appearance Effective conceptual model Represent actions by effects on screen Rapid feedback and reversability Engagement Feel that you are working on the data/task

Usability  Learnability  eFficiency  Memorability  Errors  Satisfaction (Jakob Nielson, 1994)

Performance ParameterMeanRange Eye movement time230 ms ms Decay half-life of visual image storage200 ms ms Visual Capacity17 letters7-17 letters Decay half-life of auditory storage1500 ms ms Auditory Capacity5 letters letters Perceptual processor cycle time100 ms ms Cognitive processor cycle time70 ms ms Motor processor cycle time70 ms ms Effective working memory capacity7 chunks5-9 chunks Pure working memory capacity3 chunks chunks Decay half-life of working memory7 sec5-226 sec Decay half-life of 1 chunk working memory73 sec sec Decay half-life of 3 chunks working memory7 sec5-34 sec

Human Information Processor (Card, Moran, Newell, 1986)

Gestalt grouping principles